507 lines
23 KiB
Markdown
507 lines
23 KiB
Markdown
<div align="center">
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<h1>Fork TS Checker Webpack Plugin</h1>
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<p>Webpack plugin that runs TypeScript type checker on a separate process.</p>
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[![npm version](https://img.shields.io/npm/v/fork-ts-checker-webpack-plugin.svg)](https://www.npmjs.com/package/fork-ts-checker-webpack-plugin)
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[![npm beta version](https://img.shields.io/npm/v/fork-ts-checker-webpack-plugin/beta.svg)](https://www.npmjs.com/package/fork-ts-checker-webpack-plugin)
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[![build status](https://travis-ci.org/TypeStrong/fork-ts-checker-webpack-plugin.svg?branch=master)](https://travis-ci.org/TypeStrong/fork-ts-checker-webpack-plugin)
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[![downloads](http://img.shields.io/npm/dm/fork-ts-checker-webpack-plugin.svg)](https://npmjs.org/package/fork-ts-checker-webpack-plugin)
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[![commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
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[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
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[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
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</div>
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## Installation
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This plugin requires minimum **webpack 2.3**, **TypeScript 2.1** and optionally **ESLint 6.0.0** or **TSLint 4.0**
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```sh
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# with npm
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npm install --save-dev fork-ts-checker-webpack-plugin
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# with yarn
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yarn add --dev fork-ts-checker-webpack-plugin
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```
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Basic webpack config (with [ts-loader](https://github.com/TypeStrong/ts-loader))
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```js
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const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
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const webpackConfig = {
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context: __dirname, // to automatically find tsconfig.json
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entry: './src/index.ts',
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module: {
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rules: [
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{
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test: /\.tsx?$/,
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loader: 'ts-loader',
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options: {
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// disable type checker - we will use it in fork plugin
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transpileOnly: true
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}
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}
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]
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},
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plugins: [new ForkTsCheckerWebpackPlugin()]
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};
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```
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## Motivation
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There was already similar solution - [awesome-typescript-loader](https://github.com/s-panferov/awesome-typescript-loader). You can
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add `CheckerPlugin` and delegate checker to the separate process. The problem with `awesome-typescript-loader` was that, in our case,
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it was a lot slower than [ts-loader](https://github.com/TypeStrong/ts-loader) on an incremental build (~20s vs ~3s).
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Secondly, we used [tslint](https://palantir.github.io/tslint) and we wanted to run this, along with type checker, in a separate process.
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This is why this plugin was created. To provide better performance, the plugin reuses Abstract Syntax Trees between compilations and shares
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these trees with TSLint. It can be scaled with a multi-process mode to utilize maximum CPU power.
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## Modules resolution
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It's very important to be aware that **this plugin uses [TypeScript](https://github.com/Microsoft/TypeScript)'s, not
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[webpack](https://github.com/webpack/webpack)'s modules resolution**. It means that you have to setup `tsconfig.json` correctly. For example
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if you set `files: ['./src/someFile.ts']` in `tsconfig.json`, this plugin will check only `someFile.ts` for semantic errors. It's because
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of performance. The goal of this plugin is to be _as fast as possible_. With TypeScript's module resolution we don't have to wait for webpack
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to compile files (which traverses dependency graph during compilation) - we have a full list of files from the begin.
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To debug TypeScript's modules resolution, you can use `tsc --traceResolution` command.
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## ESLint
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[ESLint is the future of linting in the TypeScript world.](https://eslint.org/blog/2019/01/future-typescript-eslint) If you'd like to use eslint with the plugin, supply this option: `eslint: true` and ensure you have the relevant dependencies installed:
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`yarn add eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin --dev`
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You should have an ESLint configuration file in your root project directory. Here is a sample `.eslintrc.js` configuration for a TypeScript project:
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```js
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const path = require('path');
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module.exports = {
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parser: '@typescript-eslint/parser', // Specifies the ESLint parser
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extends: [
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'plugin:@typescript-eslint/recommended' // Uses the recommended rules from the @typescript-eslint/eslint-plugin
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],
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parserOptions: {
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project: path.resolve(__dirname, './tsconfig.json'),
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tsconfigRootDir: __dirname,
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ecmaVersion: 2018, // Allows for the parsing of modern ECMAScript features
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sourceType: 'module', // Allows for the use of imports
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},
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rules: {
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// Place to specify ESLint rules. Can be used to overwrite rules specified from the extended configs
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// e.g. "@typescript-eslint/explicit-function-return-type": "off",
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}
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};
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```
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There's a good explanation on setting up TypeScript ESLint support by Robert Cooper [here](https://dev.to/robertcoopercode/using-eslint-and-prettier-in-a-typescript-project-53jb).
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## TSLint
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*[TSLint is being replaced by ESLint](https://medium.com/palantir/tslint-in-2019-1a144c2317a9).
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https://eslint.org/blog/2019/01/future-typescript-eslint. As a consequence, support for TSLint in fork-ts-checker-webpack-plugin will be deprecated and removed in future versions of the plugin.*
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If you have installed [tslint](https://palantir.github.io/tslint), you can enable it by setting `tslint: true` or
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`tslint: './path/to/tslint.json'`. We recommend changing `defaultSeverity` to a `"warning"` in `tslint.json` file.
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It helps to distinguish lints from TypeScript's diagnostics.
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## Options
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- **tsconfig** `string`:
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Path to _tsconfig.json_ file. Default: `path.resolve(compiler.options.context, './tsconfig.json')`.
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- **compilerOptions** `object`:
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Allows overriding TypeScript options. Should be specified in the same format as you would do for the `compilerOptions` property in tsconfig.json. Default: `{}`.
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- **eslint** `true | undefined`:
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- If `true`, this activates eslint support.
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- **eslintOptions** `object`:
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- Options that can be used to initialise ESLint. See https://eslint.org/docs/1.0.0/developer-guide/nodejs-api#cliengine
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- **tslint** `string | true | undefined`:
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- If `string`, path to _tslint.json_ file to check source files against.
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- If `true`, path to `tslint.json` file will be computed with respect to currently checked file, just like TSLint
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CLI would do. Suppose you have a project:
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```
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./
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tslint.json
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src/
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file.ts
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anotherFile.ts
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lib/
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tslint.json
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someHelperFile.ts
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```
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In such a case `src/file.ts` and `src/anotherFile.ts` would be checked against root `tslint.json`, and
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`src/lib/someHelperFile.ts` would be checked against `src/lib/tslint.json`.
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Default: `undefined`.
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- **tslintAutoFix** `boolean`:
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Passes on `--fix` flag while running `tslint` to auto fix linting errors. Default: false.
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- **watch** `string | string[]`:
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Directories or files to watch by service. Not necessary but improves performance (reduces number of `fs.stat` calls). Not applicable when `useTypescriptIncrementalApi` is `true`, in which case watching is handled automatically.
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- **async** `boolean`:
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True by default - `async: false` can block webpack's emit to wait for type checker/linter and to add errors to the webpack's compilation.
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We recommend to set this to `false` in projects where type checking is faster than webpack's build - it's better for integration with other plugins. Another scenario where you might want to set this to `false` is if you use the `overlay` functionality of `webpack-dev-server`.
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- **ignoreDiagnostics** `number[]`:
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List of TypeScript diagnostic codes to ignore.
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- **ignoreLints** `string[]`:
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List of tslint rule names to ignore.
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- **ignoreLintWarnings** `boolean`:
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If true, will ignore all lint warnings.
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- **reportFiles** `string[]`:
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Only report errors on files matching these glob patterns. This can be useful when certain types definitions have errors that are not fatal to your application. Default: `[]`. Please note that this may behave unexpectedly if using the incremental API as the incremental API doesn't look for global and semantic errors [if it has already found syntactic errors](https://github.com/Microsoft/TypeScript/blob/89386ddda7dafc63cb35560e05412487f47cc267/src/compiler/watch.ts#L141).
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```js
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// in webpack.config.js
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new ForkTsCheckerWebpackPlugin({
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reportFiles: ['src/**/*.{ts,tsx}', '!src/skip.ts']
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});
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```
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- **colors** `boolean`:
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If `false`, disables built-in colors in logger messages. Default: `true`.
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- **logger** `object`:
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Logger instance. It should be object that implements method: `error`, `warn`, `info`. Default: `console`.
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- **formatter** `'default' | 'codeframe' | ((message: NormalizedMessage, useColors: boolean) => string)`:
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Formatter for diagnostics and lints. By default uses `default` formatter. You can also pass your own formatter as a function
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(see `src/NormalizedMessage.js` and `src/formatter/` for api reference).
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- **formatterOptions** `object`:
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Options passed to formatters (currently only `codeframe` - see [available options](https://www.npmjs.com/package/babel-code-frame#options))
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- **silent** `boolean`:
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If `true`, logger will not be used. Default: `false`.
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- **checkSyntacticErrors** `boolean`:
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This option is useful if you're using ts-loader in `happyPackMode` with [HappyPack](https://github.com/amireh/happypack) or [thread-loader](https://github.com/webpack-contrib/thread-loader) to parallelise your builds. If `true` it will ensure that the plugin checks for _both_ syntactic errors (eg `const array = [{} {}];`) and semantic errors (eg `const x: number = '1';`). By default the plugin only checks for semantic errors. This is because when ts-loader is used in `transpileOnly` mode, ts-loader will still report syntactic errors. When used in `happyPackMode` it does not. Default: `false`.
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- **memoryLimit** `number`:
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Memory limit for service process in MB. If service exits with allocation failed error, increase this number. Default: `2048`.
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- **workers** `number`:
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You can split type checking to a few workers to speed-up increment build. **Be careful** - if you don't want to increase build time, you
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should keep free 1 core for _build_ and 1 core for a _system_ _(for example system with 4 CPUs should use max 2 workers)_. Second thing -
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node doesn't share memory between workers - keep in mind that memory usage will increase. Be aware that in some scenarios increasing workers
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number **can increase checking time**. Default: `ForkTsCheckerWebpackPlugin.ONE_CPU`.
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- **vue** `boolean | { enabled: boolean, compiler: string }`:
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If `true` or `enabled: true`, the linter and compiler will process VueJs single-file-component (.vue) files. See the
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[Vue section](https://github.com/TypeStrong/fork-ts-checker-webpack-plugin#vue) further down for information on how to correctly setup your project.
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- **useTypescriptIncrementalApi** `boolean`:
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If true, the plugin will use incremental compilation API introduced in TypeScript 2.7. In this mode you can only have 1
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worker, but if the changes in your code are small (like you normally have when you work in 'watch' mode), the compilation
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may be much faster, even compared to multi-threaded compilation. Defaults to `true` when working with TypeScript 3+ and `false` when below 3. The default can be overridden by directly specifying a value.
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- **measureCompilationTime** `boolean`:
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If true, the plugin will measure the time spent inside the compilation code. This may be useful to compare modes,
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especially if there are other loaders/plugins involved in the compilation. **requires node 8+**
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- **typescript** `string`:
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If supplied this is a custom path where `typescript` can be found. Defaults to `require.resolve('typescript')`.
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- **resolveModuleNameModule** and **resolveTypeReferenceDirectiveModule** `string`:
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Both of those options refer to files on the disk that respectively export a `resolveModuleName` or a `resolveTypeReferenceDirectiveModule` function. These functions will be used to resolve the import statements and the `<reference types="...">` directives instead of the default TypeScript implementation. Check the following code for an example of what those functions should look like:
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<details>
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<summary>Code sample</summary>
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```js
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const { resolveModuleName } = require(`ts-pnp`);
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exports.resolveModuleName = (
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typescript,
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moduleName,
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containingFile,
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compilerOptions,
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resolutionHost
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) => {
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return resolveModuleName(
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moduleName,
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containingFile,
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compilerOptions,
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resolutionHost,
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typescript.resolveModuleName
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);
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};
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exports.resolveTypeReferenceDirective = (
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typescript,
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moduleName,
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containingFile,
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compilerOptions,
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resolutionHost
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) => {
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return resolveModuleName(
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moduleName,
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containingFile,
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compilerOptions,
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resolutionHost,
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typescript.resolveTypeReferenceDirective
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);
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};
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```
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</details>
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### Pre-computed consts:
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- `ForkTsCheckerWebpackPlugin.ONE_CPU` - always use one CPU
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- `ForkTsCheckerWebpackPlugin.ALL_CPUS` - always use all CPUs (will increase build time)
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- `ForkTsCheckerWebpackPlugin.ONE_CPU_FREE` - leave only one CPU for build (probably will increase build time)
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- `ForkTsCheckerWebpackPlugin.TWO_CPUS_FREE` - **recommended** - leave two CPUs free (one for build, one for system)
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## Different behaviour in watch mode
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If you turn on [webpacks watch mode](https://webpack.js.org/configuration/watch/#watch) the `fork-ts-checker-notifier-webpack-plugin` will take care of logging type errors, _not_ webpack itself. That means if you set `silent: true` you won't see type errors in your console in watch mode.
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You can either set `silent: false` to show the logging from `fork-ts-checker-notifier-webpack-plugin` _or_ set `async: false`. Now webpack itself will log type errors again, but note that this can slow down your builds depending on the size of your project.
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## Notifier
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You may already be using the excellent [webpack-notifier](https://github.com/Turbo87/webpack-notifier) plugin to make build failures more obvious in the form of system notifications. There's an equivalent notifier plugin designed to work with the `fork-ts-checker-webpack-plugin`. It is the `fork-ts-checker-notifier-webpack-plugin` and can be found [here](https://github.com/johnnyreilly/fork-ts-checker-notifier-webpack-plugin). This notifier deliberately has a similar API as the `webpack-notifier` plugin to make migration easier.
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## Known Issue Watching Non-Emitting Files
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At present there is an issue with the plugin regarding the triggering of type-checking when a change is made in a source file that will not emit js. If you have a file which contains only `interface`s and / or `type`s then changes to it will **not** trigger the type checker whilst in watch mode. Sorry about that.
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We hope this will be resolved in future; the issue can be tracked [here](https://github.com/TypeStrong/fork-ts-checker-webpack-plugin/issues/36).
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## Plugin Hooks
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This plugin provides some custom webpack hooks (all are sync):
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| Event name | Hook Access Key | Description | Params |
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| --------------------------------------- | -------------------- | ------------------------------------------------------------------------------ | -------------------------------------------------------------------------- |
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| `fork-ts-checker-cancel` | `cancel` | Cancellation has been requested | `cancellationToken` |
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| `fork-ts-checker-waiting` | `waiting` | Waiting for results | `hasTsLint` |
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| `fork-ts-checker-service-before-start` | `serviceBeforeStart` | Async plugin that can be used for delaying `fork-ts-checker-service-start` | - |
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| `fork-ts-checker-service-start` | `serviceStart` | Service will be started | `tsconfigPath`, `tslintPath`, `watchPaths`, `workersNumber`, `memoryLimit` |
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| `fork-ts-checker-service-start-error` | `serviceStartError` | Cannot start service | `error` |
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| `fork-ts-checker-service-out-of-memory` | `serviceOutOfMemory` | Service is out of memory | - |
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| `fork-ts-checker-receive` | `receive` | Plugin receives diagnostics and lints from service | `diagnostics`, `lints` |
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| `fork-ts-checker-emit` | `emit` | Service will add errors and warnings to webpack compilation ('build' mode) | `diagnostics`, `lints`, `elapsed` |
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| `fork-ts-checker-done` | `done` | Service finished type checking and webpack finished compilation ('watch' mode) | `diagnostics`, `lints`, `elapsed` |
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The **Event name** is there for backward compatibility with webpack 2/3. Regardless
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of the version of webpack (2, 3 or 4) you are using, we will always access plugin hooks with **Hook Access Keys** as
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described below.
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### Accessing plugin hooks
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All plugin hooks are compatible with both [webpack](https://webpack.js.org) version
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4 and version 2. To access plugin hooks and tap into the event, we need to use
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the `getCompilerHooks` static method. When we call this method with a [webpack compiler instance](https://webpack.js.org/api/node/),
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it returns the series of [tapable](https://github.com/webpack/tapable)
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hooks where you can pass in your callbacks.
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```js
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// require the plugin
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const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
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// setup compiler with the plugin
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const compiler = webpack({
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// .. webpack config
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});
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// Optionally add the plugin to the compiler
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// **Don't do this if already added through configuration**
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new ForkTsCheckerWebpackPlugin({
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silent: true,
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async: true
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}).apply(compiler);
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// Now get the plugin hooks from compiler
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const tsCheckerHooks = ForkTsCheckerWebpackPlugin.getCompilerHooks(compiler);
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// These hooks provide access to different events
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// =================================================== //
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// The properties of tsCheckerHooks corresponds to the //
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// Hook Access Key of the table above. //
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// =================================================== //
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// Example, if we want to run some code when plugin has received diagnostics
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// and lint
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tsCheckerHooks.receive.tap('yourListenerName', (diagnostics, lint) => {
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// do something with diagnostics, perhaps show custom message
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console.log(diagnostics);
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});
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// Say we want to show some message when plugin is waiting for typecheck results
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tsCheckerHooks.waiting.tap('yourListenerName', () => {
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console.log('waiting for typecheck results');
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});
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```
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Calling `.tap()` on any hooks, requires two arguments.
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##### `name` (`string`)
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The first argument passed to `.tap` is the name of your listener callback (`yourListenerName`).
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It doesn't need to correspond to anything special. It is intended to be used
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[internally](https://github.com/webpack/tapable#interception) as the `name` of
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the hook.
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##### `callback` (`function`)
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The second argument is the callback function. Depending on the hook you are
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tapping into, several arguments are passed to the function. Do check the table
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above to find out which arguments are passed to which hooks.
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### Accessing hooks on Webpack Multi-Compiler instance
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The above method will not work on webpack [multi compiler](https://webpack.js.org/api/node/#multicompiler)
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instance. The reason is `getCompilerHooks` expects (at lease as of now) the same
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compiler instance to be passed where the plugin was attached. So in case of
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multi compiler, we need to access individual compiler instances.
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```js
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const ForkTsCheckerWebpackPlugin = require('fork-ts-checker-webpack-plugin');
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// setup multi compiler with the plugin
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const compiler = webpack([
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{
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// .. webpack config
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},
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{
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// .. webpack config
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}
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]);
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// safely determine if instance is multi-compiler
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if ('compilers' in compiler) {
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compiler.compilers.forEach(singleCompiler => {
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// get plugin hooks from the single compiler instance
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const tsCheckerHooks = ForkTsCheckerWebpackPlugin.getCompilerHooks(
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singleCompiler
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);
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// now access hooks just like before
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tsCheckerHooks.waiting.tap('yourListenerName', () => {
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console.log('waiting for typecheck results');
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});
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});
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}
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```
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## Vue
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1. Turn on the vue option in the plugin in your webpack config:
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```js
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|
new ForkTsCheckerWebpackPlugin({
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tslint: true,
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|
vue: true
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|
});
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|
```
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|
Optionally change default [vue-template-compiler](https://github.com/vuejs/vue/tree/dev/packages/vue-template-compiler) to [nativescript-vue-template-compiler](https://github.com/nativescript-vue/nativescript-vue/tree/master/packages/nativescript-vue-template-compiler) if you use [nativescript-vue](https://github.com/nativescript-vue/nativescript-vue)
|
|
```
|
|
new ForkTsCheckerWebpackPlugin({
|
|
tslint: true,
|
|
vue: { enabled: true, compiler: 'nativescript-vue-template-compiler' }
|
|
});
|
|
```
|
|
|
|
2. To activate TypeScript in your `.vue` files, you need to ensure your script tag's language attribute is set
|
|
to `ts` or `tsx` (also make sure you include the `.vue` extension in all your import statements as shown below):
|
|
|
|
```html
|
|
<script lang="ts">
|
|
import Hello from '@/components/hello.vue';
|
|
|
|
// ...
|
|
</script>
|
|
```
|
|
|
|
3. Ideally you are also using `ts-loader` (in transpileOnly mode). Your Webpack config rules may look something like this:
|
|
|
|
```js
|
|
{
|
|
test: /\.ts$/,
|
|
loader: 'ts-loader',
|
|
include: [resolve('src'), resolve('test')],
|
|
options: {
|
|
appendTsSuffixTo: [/\.vue$/],
|
|
transpileOnly: true
|
|
}
|
|
},
|
|
{
|
|
test: /\.vue$/,
|
|
loader: 'vue-loader',
|
|
options: vueLoaderConfig
|
|
},
|
|
```
|
|
|
|
4. Add rules to your `tslint.json` and they will be applied to Vue files. For example, you could apply the Standard JS rules [tslint-config-standard](https://github.com/blakeembrey/tslint-config-standard) like this:
|
|
|
|
```json
|
|
{
|
|
"defaultSeverity": "error",
|
|
"extends": ["tslint-config-standard"]
|
|
}
|
|
```
|
|
|
|
5. Ensure your `tsconfig.json` includes .vue files:
|
|
|
|
```js
|
|
// tsconfig.json
|
|
{
|
|
"include": [
|
|
"src/**/*.ts",
|
|
"src/**/*.vue"
|
|
],
|
|
"exclude": [
|
|
"node_modules"
|
|
]
|
|
}
|
|
```
|
|
|
|
6. It accepts any wildcard in your TypeScript configuration:
|
|
|
|
```js
|
|
// tsconfig.json
|
|
{
|
|
"compilerOptions": {
|
|
|
|
// ...
|
|
|
|
"baseUrl": ".",
|
|
"paths": {
|
|
"@/*": [
|
|
"src/*"
|
|
],
|
|
"~/*": [
|
|
"src/*"
|
|
]
|
|
}
|
|
}
|
|
}
|
|
|
|
// In a .ts or .vue file...
|
|
import Hello from '@/components/hello.vue'
|
|
```
|
|
|
|
7. If you are working in **VSCode**, you can get extensions [Vetur](https://marketplace.visualstudio.com/items?itemName=octref.vetur) and [TSLint Vue](https://marketplace.visualstudio.com/items?itemName=prograhammer.tslint-vue) to complete the developer workflow.
|
|
|
|
## Credits
|
|
|
|
This plugin was created in [Realytics](https://www.realytics.io/) in 2017. Thank you for supporting Open Source.
|
|
|
|
## License
|
|
|
|
MIT License
|