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用于在其他目录中编译的typescript API

typescript node.js

1

Doua Beri · 技术社区 · 6 年前

我有一个包含多个 .ts 文件夹。我想编译那些 TS 到 .js 并将它们放在不同的目录中。

我受到本页示例的启发: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API

function compile(fileNames, options) {
    let program = ts.createProgram(fileNames, options);
    let emitResult = program.emit();

    let allDiagnostics = ts
        .getPreEmitDiagnostics(program)
        .concat(emitResult.diagnostics);

    allDiagnostics.forEach(diagnostic => {
        if (diagnostic.file) {
            let {line, character} = diagnostic.file.getLineAndCharacterOfPosition(
                diagnostic.start
            );
            let message = ts.flattenDiagnosticMessageText(
                diagnostic.messageText,
                "\n"
            );
            console.log(
                `${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`
            );
        } else {
            console.log(
                `${ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n")}`
            );
        }
    });

    let exitCode = emitResult.emitSkipped ? 1 : 0;
    console.log(`Process exiting with code '${exitCode}'.`);
    process.exit(exitCode);
}

然后我用 outDir 在编译器选项对象中

compile(["test.ts"], {
    noEmitOnError: false,
    noImplicitAny: false,
    target: ts.ScriptTarget.ES5,
    module: ts.ModuleKind.ESNext,
    outDir: "output" // files are placed in a directory called output
});

不过,我很好奇是否有不同的方法来决定在哪里写 JS 不涉及的文件 Outdir 编译器选项的属性。

注: 我在找一个使用typescript API而不是命令行的答案 tsc

1 回复 | 直到 6 年前

1

artem 6 年前

第二个论点 emit() 是 writeFile?: WriteFileCallback . 您可以尝试使用它,并以您需要的任何方式自己编写文件:

program.emit(undefined, yourOwnWriteFileFunction);

此外,根据评论和规范, ts.createProgram() 接受的自定义实现 CompilerHost 也可以覆盖 writeFile :

export interface CompilerHost extends ModuleResolutionHost {
    ....
    writeFile: WriteFileCallback;

Relevant part of Program interface

export interface Program extends ScriptReferenceHost {

    /**
     * Emits the JavaScript and declaration files.  If targetSourceFile is not specified, then
     * the JavaScript and declaration files will be produced for all the files in this program.
     * If targetSourceFile is specified, then only the JavaScript and declaration for that
     * specific file will be generated.
     *
     * If writeFile is not specified then the writeFile callback from the compiler host will be
     * used for writing the JavaScript and declaration files.  Otherwise, the writeFile parameter
     * will be invoked when writing the JavaScript and declaration files.
     */
    emit(targetSourceFile?: SourceFile, writeFile?: WriteFileCallback, cancellationToken?: CancellationToken, emitOnlyDtsFiles?: boolean, customTransformers?: CustomTransformers): EmitResult;

请注意,API的这些部分没有记录在typescript wiki上,因此如果您决定使用它们,应该密切关注 breaking API changes page .