webpack/lib/RuntimeTemplate.js

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

const Template = require("./Template");

module.exports = class RuntimeTemplate {
	constructor(outputOptions, requestShortener) {
		this.outputOptions = outputOptions || {};
		this.requestShortener = requestShortener;
	}

	comment({
		request,
		chunkName,
		chunkReason,
		message,
		exportName
	}) {
		let content;
		if(this.outputOptions.pathinfo) {
			content = [message, request, chunkName, chunkReason].filter(Boolean).map(item => this.requestShortener.shorten(item)).join(" | ");
		} else {
			content = [message, chunkName, chunkReason].filter(Boolean).map(item => this.requestShortener.shorten(item)).join(" | ");
		}
		if(!content) return "";
		if(this.outputOptions.pathinfo) {
			return Template.toComment(content) + " ";
		} else {
			return Template.toNormalComment(content) + " ";
		}
	}

	throwMissingModuleErrorFunction({
		request
	}) {
		const err = `Cannot find module "${request}"`;
		return `function webpackMissingModule() { var e = new Error(${JSON.stringify(err)}); e.code = 'MODULE_NOT_FOUND'; throw e; }`;
	}

	missingModule({
		request
	}) {
		return `!(${this.throwMissingModuleErrorFunction({ request })}())`;
	}

	missingModuleStatement({
		request
	}) {
		return `${this.missingModule({ request })};\n`;
	}

	missingModulePromise({
		request
	}) {
		return `Promise.resolve().then(${this.throwMissingModuleErrorFunction({ request })})`;
	}

	moduleId({
		module,
		request
	}) {
		if(!module) return this.missingModule({
			request
		});
		return `${this.comment({ request })}${JSON.stringify(module.id)}`;
	}

	moduleRaw({
		module,
		request
	}) {
		if(!module) return this.missingModule({
			request
		});
		return `__webpack_require__(${this.moduleId({ module, request })})`;
	}

	moduleExports({
		module,
		request
	}) {
		return this.moduleRaw({
			module,
			request
		});
	}

	moduleNamespace({
		module,
		request,
		strict
	}) {
		const rawModule = this.moduleRaw({
			module,
			request
		});
		const exportsType = module.buildMeta && module.buildMeta.exportsType;
		if(exportsType === "namespace") {
			return rawModule;
		} else if(exportsType === "named") {
			return `Object.assign({/* fake namespace object */}, ${rawModule}, { "default": ${rawModule} })`;
		} else if(strict) {
			return `Object({ /* fake namespace object */ "default": ${rawModule} })`;
		} else {
			return `Object(function() { var module = ${rawModule}; return typeof module === "object" && module && module.__esModule ? module : { /* fake namespace object */ "default": module }; }())`;
		}
	}

	moduleNamespacePromise({
		block,
		module,
		request,
		message,
		strict,
		weak
	}) {
		if(!module) return this.missingModulePromise({
			request
		});
		const promise = this.blockPromise({
			block,
			message
		});

		let getModuleFunction;
		let idExpr = JSON.stringify(module.id);
		const comment = this.comment({
			request
		});
		let header = "";
		if(weak) {
			if(idExpr.length > 8) { // 'var x="nnnnnn";x,"+x+",x' vs '"nnnnnn",nnnnnn,"nnnnnn"'
				header += `var id = ${idExpr}; `;
				idExpr = "id";
			}
			header += `if(!__webpack_require__.m[${idExpr}]) { var e = new Error("Module '" + ${idExpr} + "' is not available (weak dependency)"); e.code = 'MODULE_NOT_FOUND'; throw e; } `;
		}
		const rawModule = this.moduleRaw({
			module,
			request
		});
		const exportsType = module.buildMeta && module.buildMeta.exportsType;
		if(exportsType === "namespace") {
			if(header) {
				getModuleFunction = `function() { ${header}return ${rawModule}; }`;
			} else {
				getModuleFunction = `__webpack_require__.bind(null, ${comment}${idExpr})`;
			}
		} else if(exportsType === "named") {
			getModuleFunction = `function() { ${header}var module = ${rawModule}; return Object.assign({/* fake namespace object */}, module, { "default": module }); }`;
		} else if(strict) {
			getModuleFunction = `function() { ${header}return { /* fake namespace object */ "default": ${rawModule} }; }`;
		} else {
			getModuleFunction = `function() { ${header}var module = ${rawModule}; return typeof module === "object" && module && module.__esModule ? module : { /* fake namespace object */ "default": module }; }`;
		}

		return `${promise || "Promise.resolve()"}.then(${getModuleFunction})`;
	}

	importStatement({
		update,
		module,
		request,
		importVar,
		originModule
	}) {
		if(!module) return this.missingModuleStatement({
			request
		});
		const comment = this.comment({
			request
		});
		const optDeclaration = update ? "" : "var ";

		const exportsType = module.buildMeta && module.buildMeta.exportsType;
		let content = `/* harmony import */ ${optDeclaration}${importVar} = __webpack_require__(${comment}${JSON.stringify(module.id)});\n`;

		if(!exportsType && !originModule.buildMeta.strictHarmonyModule) {
			content += `/* harmony import */ ${optDeclaration}${importVar}_default = /*#__PURE__*/__webpack_require__.n(${importVar});\n`;
		}
		if(exportsType === "named") {
			if(Array.isArray(module.buildMeta.providedExports))
				content += `${optDeclaration}${importVar}_namespace = /*#__PURE__*/Object.assign({}, ${importVar}, {"default": ${importVar}});\n`;
			else
				content += `${optDeclaration}${importVar}_namespace = /*#__PURE__*/{ /* fake namespace object */ "default": ${importVar} };\n`;
		}
		return content;
	}

	exportFromImport({
		module,
		request,
		exportName,
		originModule,
		asiSafe,
		isCall,
		callContext,
		importVar
	}) {
		if(!module) return this.missingModule({
			request
		});
		const exportsType = module.buildMeta && module.buildMeta.exportsType;

		if(!exportsType) {
			if(exportName === "default") {
				if(!originModule.buildMeta.strictHarmonyModule) {
					if(isCall)
						return `${importVar}_default()`;
					else if(asiSafe)
						return `(${importVar}_default())`;
					else
						return `${importVar}_default.a`;
				} else {
					return importVar;
				}
			} else if(originModule.buildMeta.strictHarmonyModule) {
				if(exportName) {
					return "/* non-default import from non-esm module */undefined";
				} else if(!exportName) {
					if(asiSafe) {
						return `/*#__PURE__*/{ /* fake namespace object */ "default": ${importVar} }`;
					} else {
						return `/*#__PURE__*/Object({ /* fake namespace object */ "default": ${importVar} })`;
					}
				}
			}
		}

		if(exportsType === "named") {
			if(exportName === "default") {
				return importVar;
			} else if(!exportName) {
				return `${importVar}_namespace`;
			}
		}

		if(exportName) {
			const used = module.isUsed(exportName);
			const comment = used !== exportName ? Template.toNormalComment(exportName) + " " : "";
			const access = `${importVar}[${comment}${JSON.stringify(used)}]`;
			if(isCall) {
				if(callContext === false && asiSafe)
					return `(0,${access})`;
				else if(callContext === false)
					return `Object(${access})`;
			}
			return access;
		} else {
			return importVar;
		}
	}

	blockPromise({
		block,
		message
	}) {
		if(!block || !block.chunkGroup || block.chunkGroup.chunks.length === 0) {
			const comment = this.comment({
				message
			});
			return `Promise.resolve(${comment.trim()})`;
		}
		const chunks = block.chunkGroup.chunks.filter(chunk => !chunk.hasRuntime() && chunk.id !== null);
		const comment = this.comment({
			message,
			chunkName: block.chunkName,
			chunkReason: block.chunkReason
		});
		if(chunks.length === 1) {
			const chunkId = JSON.stringify(chunks[0].id);
			return `__webpack_require__.e(${comment}${chunkId})`;
		} else if(chunks.length > 0) {
			const requireChunkId = chunk => `__webpack_require__.e(${JSON.stringify(chunk.id)})`;
			return `Promise.all(${comment.trim()}[${chunks.map(requireChunkId).join(", ")}])`;
		} else {
			return `Promise.resolve(${comment.trim()})`;
		}
	}

	onError() {
		return "__webpack_require__.oe";
	}

	defineEsModuleFlagStatement({
		exportsArgument
	}) {
		return `__webpack_require__.r(${exportsArgument});\n`;
	}
};