118 lines
3.4 KiB
JavaScript
118 lines
3.4 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const EnvironmentNotSupportAsyncWarning = require("../EnvironmentNotSupportAsyncWarning");
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const { JAVASCRIPT_MODULE_TYPE_ESM } = require("../ModuleTypeConstants");
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const DynamicExports = require("./DynamicExports");
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const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
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const HarmonyExports = require("./HarmonyExports");
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/** @typedef {import("../Module").BuildMeta} BuildMeta */
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/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
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/** @typedef {import("./HarmonyModulesPlugin").HarmonyModulesPluginOptions} HarmonyModulesPluginOptions */
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const PLUGIN_NAME = "HarmonyDetectionParserPlugin";
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module.exports = class HarmonyDetectionParserPlugin {
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/**
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* @param {HarmonyModulesPluginOptions} options options
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*/
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constructor(options) {
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const { topLevelAwait = false } = options || {};
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this.topLevelAwait = topLevelAwait;
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}
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/**
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* @param {JavascriptParser} parser the parser
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* @returns {void}
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*/
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apply(parser) {
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parser.hooks.program.tap(PLUGIN_NAME, (ast) => {
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const isStrictHarmony =
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parser.state.module.type === JAVASCRIPT_MODULE_TYPE_ESM;
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const isHarmony =
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isStrictHarmony ||
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ast.body.some(
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(statement) =>
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statement.type === "ImportDeclaration" ||
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statement.type === "ExportDefaultDeclaration" ||
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statement.type === "ExportNamedDeclaration" ||
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statement.type === "ExportAllDeclaration"
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);
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if (isHarmony) {
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const module = parser.state.module;
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const compatDep = new HarmonyCompatibilityDependency();
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compatDep.loc = {
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start: {
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line: -1,
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column: 0
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},
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end: {
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line: -1,
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column: 0
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},
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index: -3
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};
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module.addPresentationalDependency(compatDep);
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DynamicExports.bailout(parser.state);
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HarmonyExports.enable(parser.state, isStrictHarmony);
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parser.scope.isStrict = true;
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}
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});
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parser.hooks.topLevelAwait.tap(PLUGIN_NAME, () => {
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const module = parser.state.module;
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if (!this.topLevelAwait) {
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throw new Error(
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"The top-level-await experiment is not enabled (set experiments.topLevelAwait: true to enable it)"
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);
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}
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if (!HarmonyExports.isEnabled(parser.state)) {
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throw new Error(
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"Top-level-await is only supported in EcmaScript Modules"
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);
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}
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/** @type {BuildMeta} */
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(module.buildMeta).async = true;
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EnvironmentNotSupportAsyncWarning.check(
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module,
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parser.state.compilation.runtimeTemplate,
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"topLevelAwait"
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);
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});
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/**
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* @returns {boolean | undefined} true if in harmony
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*/
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const skipInHarmony = () => {
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if (HarmonyExports.isEnabled(parser.state)) {
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return true;
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}
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};
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/**
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* @returns {null | undefined} null if in harmony
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*/
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const nullInHarmony = () => {
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if (HarmonyExports.isEnabled(parser.state)) {
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return null;
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}
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};
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const nonHarmonyIdentifiers = ["define", "exports"];
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for (const identifier of nonHarmonyIdentifiers) {
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parser.hooks.evaluateTypeof
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.for(identifier)
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.tap(PLUGIN_NAME, nullInHarmony);
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parser.hooks.typeof.for(identifier).tap(PLUGIN_NAME, skipInHarmony);
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parser.hooks.evaluate.for(identifier).tap(PLUGIN_NAME, nullInHarmony);
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parser.hooks.expression.for(identifier).tap(PLUGIN_NAME, skipInHarmony);
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parser.hooks.call.for(identifier).tap(PLUGIN_NAME, skipInHarmony);
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}
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}
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};
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