Method _loadEnv

lib/DotenvPlugin.js:367–423

* Loads the provided compiler. * @private * @param {Compiler} compiler compiler * @param {ItemCacheFacade} itemCache item cache facade * @param {string} dir directory to read * @returns {Promise<{ parsed: Env, snapshot: Snapshot }>} parsed result and snapshot

(compiler, itemCache, dir)

	 * @returns {Promise<{ parsed: Env, snapshot: Snapshot }>} parsed result and snapshot
	 */
	async _loadEnv(compiler, itemCache, dir) {
		const fs = /** @type {InputFileSystem} */ (compiler.inputFileSystem);
		const fileSystemInfo = new FileSystemInfo(fs, {
			unmanagedPaths: compiler.unmanagedPaths,
			managedPaths: compiler.managedPaths,
			immutablePaths: compiler.immutablePaths,
			hashFunction: compiler.options.output.hashFunction
		});

		const result = await itemCache.getPromise();

		if (result) {
			const isSnapshotValid = await new Promise((resolve, reject) => {
				fileSystemInfo.checkSnapshotValid(result.snapshot, (error, isValid) => {
					if (error) {
						reject(error);

						return;
					}

					resolve(isValid);
				});
			});

			if (isSnapshotValid) {
				return { parsed: result.parsed, snapshot: result.snapshot };
			}
		}

		const { parsed, fileDependencies, missingDependencies } =
			await this._getParsed(
				fs,
				dir,
				/** @type {string} */
				(compiler.options.mode)
			);

		const startTime = Date.now();
		const newSnapshot = await new Promise((resolve, reject) => {
			fileSystemInfo.createSnapshot(
				startTime,
				fileDependencies,
				null,
				missingDependencies,
				class="cm">// `.env` files are build dependencies
				compiler.options.snapshot.buildDependencies,
				(err, snapshot) => {
					if (err) return reject(err);
					resolve(snapshot);
				}
			);
		});

		await itemCache.storePromise({ parsed, snapshot: newSnapshot });

		return { parsed, snapshot: newSnapshot };
	}