webpack/lib/dependencies/HarmonyExportDependencyParserPlugin.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 InnerGraph = require("../optimize/InnerGraph");
const ConstDependency = require("./ConstDependency");
const HarmonyExportExpressionDependency = require("./HarmonyExportExpressionDependency");
const HarmonyExportHeaderDependency = require("./HarmonyExportHeaderDependency");
const HarmonyExportImportedSpecifierDependency = require("./HarmonyExportImportedSpecifierDependency");
const HarmonyExportSpecifierDependency = require("./HarmonyExportSpecifierDependency");
const { ExportPresenceModes } = require("./HarmonyImportDependency");
const {
	harmonySpecifierTag,
	getAssertions
} = require("./HarmonyImportDependencyParserPlugin");
const HarmonyImportSideEffectDependency = require("./HarmonyImportSideEffectDependency");

const { HarmonyStarExportsList } = HarmonyExportImportedSpecifierDependency;

module.exports = class HarmonyExportDependencyParserPlugin {
	constructor(options) {
		this.exportPresenceMode =
			options.reexportExportPresence !== undefined
				? ExportPresenceModes.fromUserOption(options.reexportExportPresence)
				: options.exportPresence !== undefined
				? ExportPresenceModes.fromUserOption(options.exportPresence)
				: options.strictExportPresence
				? ExportPresenceModes.ERROR
				: ExportPresenceModes.AUTO;
	}

	apply(parser) {
		const { exportPresenceMode } = this;
		parser.hooks.export.tap(
			"HarmonyExportDependencyParserPlugin",
			statement => {
				const dep = new HarmonyExportHeaderDependency(
					statement.declaration && statement.declaration.range,
					statement.range
				);
				dep.loc = Object.create(statement.loc);
				dep.loc.index = -1;
				parser.state.module.addPresentationalDependency(dep);
				return true;
			}
		);
		parser.hooks.exportImport.tap(
			"HarmonyExportDependencyParserPlugin",
			(statement, source) => {
				parser.state.lastHarmonyImportOrder =
					(parser.state.lastHarmonyImportOrder || 0) + 1;
				const clearDep = new ConstDependency("", statement.range);
				clearDep.loc = Object.create(statement.loc);
				clearDep.loc.index = -1;
				parser.state.module.addPresentationalDependency(clearDep);
				const sideEffectDep = new HarmonyImportSideEffectDependency(
					source,
					parser.state.lastHarmonyImportOrder,
					getAssertions(statement)
				);
				sideEffectDep.loc = Object.create(statement.loc);
				sideEffectDep.loc.index = -1;
				parser.state.current.addDependency(sideEffectDep);
				return true;
			}
		);
		parser.hooks.exportExpression.tap(
			"HarmonyExportDependencyParserPlugin",
			(statement, expr) => {
				const isFunctionDeclaration = expr.type === "FunctionDeclaration";
				const comments = parser.getComments([
					statement.range[0],
					expr.range[0]
				]);
				const dep = new HarmonyExportExpressionDependency(
					expr.range,
					statement.range,
					comments
						.map(c => {
							switch (c.type) {
								case "Block":
									return `/*${c.value}*/`;
								case "Line":
									return `//${c.value}\n`;
							}
							return "";
						})
						.join(""),
					expr.type.endsWith("Declaration") && expr.id
						? expr.id.name
						: isFunctionDeclaration
						? {
								id: expr.id ? expr.id.name : undefined,
								range: [
									expr.range[0],
									expr.params.length > 0
										? expr.params[0].range[0]
										: expr.body.range[0]
								],
								prefix: `${expr.async ? "async " : ""}function${
									expr.generator ? "*" : ""
								} `,
								suffix: `(${expr.params.length > 0 ? "" : ") "}`
						  }
						: undefined
				);
				dep.loc = Object.create(statement.loc);
				dep.loc.index = -1;
				parser.state.current.addDependency(dep);
				InnerGraph.addVariableUsage(
					parser,
					expr.type.endsWith("Declaration") && expr.id
						? expr.id.name
						: "*default*",
					"default"
				);
				return true;
			}
		);
		parser.hooks.exportSpecifier.tap(
			"HarmonyExportDependencyParserPlugin",
			(statement, id, name, idx) => {
				const settings = parser.getTagData(id, harmonySpecifierTag);
				let dep;
				const harmonyNamedExports = (parser.state.harmonyNamedExports =
					parser.state.harmonyNamedExports || new Set());
				harmonyNamedExports.add(name);
				InnerGraph.addVariableUsage(parser, id, name);
				if (settings) {
					dep = new HarmonyExportImportedSpecifierDependency(
						settings.source,
						settings.sourceOrder,
						settings.ids,
						name,
						harmonyNamedExports,
						null,
						exportPresenceMode,
						null,
						settings.assertions
					);
				} else {
					dep = new HarmonyExportSpecifierDependency(id, name);
				}
				dep.loc = Object.create(statement.loc);
				dep.loc.index = idx;
				parser.state.current.addDependency(dep);
				return true;
			}
		);
		parser.hooks.exportImportSpecifier.tap(
			"HarmonyExportDependencyParserPlugin",
			(statement, source, id, name, idx) => {
				const harmonyNamedExports = (parser.state.harmonyNamedExports =
					parser.state.harmonyNamedExports || new Set());
				let harmonyStarExports = null;
				if (name) {
					harmonyNamedExports.add(name);
				} else {
					harmonyStarExports = parser.state.harmonyStarExports =
						parser.state.harmonyStarExports || new HarmonyStarExportsList();
				}
				const dep = new HarmonyExportImportedSpecifierDependency(
					source,
					parser.state.lastHarmonyImportOrder,
					id ? [id] : [],
					name,
					harmonyNamedExports,
					harmonyStarExports && harmonyStarExports.slice(),
					exportPresenceMode,
					harmonyStarExports
				);
				if (harmonyStarExports) {
					harmonyStarExports.push(dep);
				}
				dep.loc = Object.create(statement.loc);
				dep.loc.index = idx;
				parser.state.current.addDependency(dep);
				return true;
			}
		);
	}
};