webpack/lib/dependencies/HarmonyImportDependencyParserPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const { SyncBailHook } = require("tapable");
const HarmonyImportSideEffectDependency = require("./HarmonyImportSideEffectDependency");
const HarmonyImportSpecifierDependency = require("./HarmonyImportSpecifierDependency");
const HarmonyAcceptImportDependency = require("./HarmonyAcceptImportDependency");
const HarmonyAcceptDependency = require("./HarmonyAcceptDependency");
const ConstDependency = require("./ConstDependency");

module.exports = class HarmonyImportDependencyParserPlugin {
	constructor(moduleOptions) {
		this.strictExportPresence = moduleOptions.strictExportPresence;
		this.strictThisContextOnImports = moduleOptions.strictThisContextOnImports;
	}

	apply(parser) {
		parser.hooks.import.tap(
			"HarmonyImportDependencyParserPlugin",
			(statement, source) => {
				parser.state.lastHarmonyImportOrder =
					(parser.state.lastHarmonyImportOrder || 0) + 1;
				const clearDep = new ConstDependency("", statement.range);
				clearDep.loc = statement.loc;
				parser.state.module.addDependency(clearDep);
				const sideEffectDep = new HarmonyImportSideEffectDependency(
					source,
					parser.state.module,
					parser.state.lastHarmonyImportOrder,
					parser.state.harmonyParserScope
				);
				sideEffectDep.loc = statement.loc;
				parser.state.module.addDependency(sideEffectDep);
				return true;
			}
		);
		parser.hooks.importSpecifier.tap(
			"HarmonyImportDependencyParserPlugin",
			(statement, source, id, name) => {
				parser.scope.definitions.delete(name);
				parser.scope.renames.set(name, "imported var");
				if (!parser.state.harmonySpecifier) {
					parser.state.harmonySpecifier = new Map();
				}
				parser.state.harmonySpecifier.set(name, {
					source,
					id,
					sourceOrder: parser.state.lastHarmonyImportOrder
				});
				return true;
			}
		);
		parser.hooks.expression
			.for("imported var")
			.tap("HarmonyImportDependencyParserPlugin", expr => {
				const name = expr.name;
				const settings = parser.state.harmonySpecifier.get(name);
				const dep = new HarmonyImportSpecifierDependency(
					settings.source,
					parser.state.module,
					settings.sourceOrder,
					parser.state.harmonyParserScope,
					settings.id,
					name,
					expr.range,
					this.strictExportPresence
				);
				dep.shorthand = parser.scope.inShorthand;
				dep.directImport = true;
				dep.loc = expr.loc;
				parser.state.module.addDependency(dep);
				return true;
			});
		parser.hooks.expressionAnyMember
			.for("imported var")
			.tap("HarmonyImportDependencyParserPlugin", expr => {
				const name = expr.object.name;
				const settings = parser.state.harmonySpecifier.get(name);
				if (settings.id !== null) return false;
				const dep = new HarmonyImportSpecifierDependency(
					settings.source,
					parser.state.module,
					settings.sourceOrder,
					parser.state.harmonyParserScope,
					expr.property.name || expr.property.value,
					name,
					expr.range,
					this.strictExportPresence
				);
				dep.shorthand = parser.scope.inShorthand;
				dep.directImport = false;
				dep.loc = expr.loc;
				parser.state.module.addDependency(dep);
				return true;
			});
		if (this.strictThisContextOnImports) {
			// only in case when we strictly follow the spec we need a special case here
			parser.hooks.callAnyMember
				.for("imported var")
				.tap("HarmonyImportDependencyParserPlugin", expr => {
					if (expr.callee.type !== "MemberExpression") return;
					if (expr.callee.object.type !== "Identifier") return;
					const name = expr.callee.object.name;
					const settings = parser.state.harmonySpecifier.get(name);
					if (settings.id !== null) return false;
					const dep = new HarmonyImportSpecifierDependency(
						settings.source,
						parser.state.module,
						settings.sourceOrder,
						parser.state.harmonyParserScope,
						expr.callee.property.name || expr.callee.property.value,
						name,
						expr.callee.range,
						this.strictExportPresence
					);
					dep.shorthand = parser.scope.inShorthand;
					dep.directImport = false;
					dep.namespaceObjectAsContext = true;
					dep.loc = expr.callee.loc;
					parser.state.module.addDependency(dep);
					if (expr.arguments) parser.walkExpressions(expr.arguments);
					return true;
				});
		}
		parser.hooks.call
			.for("imported var")
			.tap("HarmonyImportDependencyParserPlugin", expr => {
				const args = expr.arguments;
				const fullExpr = expr;
				expr = expr.callee;
				if (expr.type !== "Identifier") return;
				const name = expr.name;
				const settings = parser.state.harmonySpecifier.get(name);
				const dep = new HarmonyImportSpecifierDependency(
					settings.source,
					parser.state.module,
					settings.sourceOrder,
					parser.state.harmonyParserScope,
					settings.id,
					name,
					expr.range,
					this.strictExportPresence
				);
				dep.directImport = true;
				dep.callArgs = args;
				dep.call = fullExpr;
				dep.loc = expr.loc;
				parser.state.module.addDependency(dep);
				if (args) parser.walkExpressions(args);
				return true;
			});
		// TODO webpack 5: refactor this, no custom hooks
		if (!parser.hooks.hotAcceptCallback) {
			parser.hooks.hotAcceptCallback = new SyncBailHook([
				"expression",
				"requests"
			]);
		}
		if (!parser.hooks.hotAcceptWithoutCallback) {
			parser.hooks.hotAcceptWithoutCallback = new SyncBailHook([
				"expression",
				"requests"
			]);
		}
		parser.hooks.hotAcceptCallback.tap(
			"HarmonyImportDependencyParserPlugin",
			(expr, requests) => {
				const harmonyParserScope = parser.state.harmonyParserScope;
				if (!harmonyParserScope) {
					// This is not a harmony module, skip it
					return;
				}
				const dependencies = requests.map(request => {
					const dep = new HarmonyAcceptImportDependency(
						request,
						parser.state.module,
						harmonyParserScope
					);
					dep.loc = expr.loc;
					parser.state.module.addDependency(dep);
					return dep;
				});
				if (dependencies.length > 0) {
					const dep = new HarmonyAcceptDependency(
						expr.range,
						dependencies,
						true
					);
					dep.loc = expr.loc;
					parser.state.module.addDependency(dep);
				}
			}
		);
		parser.hooks.hotAcceptWithoutCallback.tap(
			"HarmonyImportDependencyParserPlugin",
			(expr, requests) => {
				const dependencies = requests.map(request => {
					const dep = new HarmonyAcceptImportDependency(
						request,
						parser.state.module,
						parser.state.harmonyParserScope
					);
					dep.loc = expr.loc;
					parser.state.module.addDependency(dep);
					return dep;
				});
				if (dependencies.length > 0) {
					const dep = new HarmonyAcceptDependency(
						expr.range,
						dependencies,
						false
					);
					dep.loc = expr.loc;
					parser.state.module.addDependency(dep);
				}
			}
		);
	}
};