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{"version":3,"file":"hooks.module.js","sources":["../src/index.js"],"sourcesContent":["import { options } from 'preact';\n\n/** @type {number} */\nlet currentIndex;\n\n/** @type {import('./internal').Component} */\nlet currentComponent;\n\n/** @type {import('./internal').Component} */\nlet previousComponent;\n\n/** @type {number} */\nlet currentHook = 0;\n\n/** @type {Array<import('./internal').Component>} */\nlet afterPaintEffects = [];\n\nlet EMPTY = [];\n\nlet oldBeforeDiff = options._diff;\nlet oldBeforeRender = options._render;\nlet oldAfterDiff = options.diffed;\nlet oldCommit = options._commit;\nlet oldBeforeUnmount = options.unmount;\n\nconst RAF_TIMEOUT = 100;\nlet prevRaf;\n\noptions._diff = vnode => {\n\tcurrentComponent = null;\n\tif (oldBeforeDiff) oldBeforeDiff(vnode);\n};\n\noptions._render = vnode => {\n\tif (oldBeforeRender) oldBeforeRender(vnode);\n\n\tcurrentComponent = vnode._component;\n\tcurrentIndex = 0;\n\n\tconst hooks = currentComponent.__hooks;\n\tif (hooks) {\n\t\tif (previousComponent === currentComponent) {\n\t\t\thooks._pendingEffects = [];\n\t\t\tcurrentComponent._renderCallbacks = [];\n\t\t\thooks._list.forEach(hookItem => {\n\t\t\t\thookItem._pendingValue = EMPTY;\n\t\t\t\thookItem._pendingArgs = undefined;\n\t\t\t});\n\t\t} else {\n\t\t\thooks._pendingEffects.forEach(invokeCleanup);\n\t\t\thooks._pendingEffects.forEach(invokeEffect);\n\t\t\thooks._pendingEffects = [];\n\t\t}\n\t}\n\tpreviousComponent = currentComponent;\n};\n\noptions.diffed = vnode => {\n\tif (oldAfterDiff) oldAfterDiff(vnode);\n\n\tconst c = vnode._component;\n\tif (c && c.__hooks) {\n\t\tif (c.__hooks._pendingEffects.length) afterPaint(afterPaintEffects.push(c));\n\t\tc.__hooks._list.forEach(hookItem => {\n\t\t\tif (hookItem._pendingArgs) {\n\t\t\t\thookItem._args = hookItem._pendingArgs;\n\t\t\t}\n\t\t\tif (hookItem._pendingValue !== EMPTY) {\n\t\t\t\thookItem._value = hookItem._pendingValue;\n\t\t\t}\n\t\t\thookItem._pendingArgs = undefined;\n\t\t\thookItem._pendingValue = EMPTY;\n\t\t});\n\t}\n\tpreviousComponent = currentComponent = null;\n};\n\noptions._commit = (vnode, commitQueue) => {\n\tcommitQueue.some(component => {\n\t\ttry {\n\t\t\tcomponent._renderCallbacks.forEach(invokeCleanup);\n\t\t\tcomponent._renderCallbacks = component._renderCallbacks.filter(cb =>\n\t\t\t\tcb._value ? invokeEffect(cb) : true\n\t\t\t);\n\t\t} catch (e) {\n\t\t\tcommitQueue.some(c => {\n\t\t\t\tif (c._renderCallbacks) c._renderCallbacks = [];\n\t\t\t});\n\t\t\tcommitQueue = [];\n\t\t\toptions._catchError(e, component._vnode);\n\t\t}\n\t});\n\n\tif (oldCommit) oldCommit(vnode, commitQueue);\n};\n\noptions.unmount = vnode => {\n\tif (oldBeforeUnmount) oldBeforeUnmount(vnode);\n\n\tconst c = vnode._component;\n\tif (c && c.__hooks) {\n\t\tlet hasErrored;\n\t\tc.__hooks._list.forEach(s => {\n\t\t\ttry {\n\t\t\t\tinvokeCleanup(s);\n\t\t\t} catch (e) {\n\t\t\t\thasErrored = e;\n\t\t\t}\n\t\t});\n\t\tif (hasErrored) options._catchError(hasErrored, c._vnode);\n\t}\n};\n\n/**\n * Get a hook's state from the currentComponent\n * @param {number} index The index of the hook to get\n * @param {number} type The index of the hook to get\n * @returns {any}\n */\nfunction getHookState(index, type) {\n\tif (options._hook) {\n\t\toptions._hook(currentComponent, index, currentHook || type);\n\t}\n\tcurrentHook = 0;\n\n\t// Largely inspired by:\n\t// * https://github.com/michael-klein/funcy.js/blob/f6be73468e6ec46b0ff5aa3cc4c9baf72a29025a/src/hooks/core_hooks.mjs\n\t// * https://github.com/michael-klein/funcy.js/blob/650beaa58c43c33a74820a3c98b3c7079cf2e333/src/renderer.mjs\n\t// Other implementations to look at:\n\t// * https://codesandbox.io/s/mnox05qp8\n\tconst hooks =\n\t\tcurrentComponent.__hooks ||\n\t\t(currentComponent.__hooks = {\n\t\t\t_list: [],\n\t\t\t_pendingEffects: []\n\t\t});\n\n\tif (index >= hooks._list.length) {\n\t\thooks._list.push({ _pendingValue: EMPTY });\n\t}\n\treturn hooks._list[index];\n}\n\n/**\n * @param {import('./index').StateUpdater<any>} [initialState]\n */\nexport function useState(initialState) {\n\tcurrentHook = 1
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