Ways to retrieve `CompilerOptions` from the `tsconfig.json` file

Question

Ways to retrieve `CompilerOptions` from the `tsconfig.json` file

Currently, I am delving into the TypeScript compiler API. In order to initialize a program, I need to provide a CompilerOptions object. My goal is to utilize the CompilerOptions specific to a particular tsconfig.json file, but I am struggling to determine the correct approach for this.

I have come across mentions of using parseJsonConfigFileContent, however, this also requires a ParseConfigHost. According to sources, it is apparently simple to implement on your own, although the method readDirectory seems rather complex to tackle independently. From what I can gather, one must retrieve all TypeScript files within a specified directory while taking into consideration both excludes and includes.

It stands to reason that TypeScript likely handles this internally already. How can I leverage the default functionality of readDirectory or ParseConfigHost?

To rephrase: what would be the most straightforward method to acquire the CompilerOptions tailored to a particular TypeScript project?

typescript typescript-compiler-api

Answer 1

Answer №1

By utilizing the following code snippet, I managed to effortlessly retrieve the compiler options.

Although I have not yet encountered any constraints, it appears to function smoothly while solely relying on resources provided by Typescript:

const configurationFile = ts.findConfigFile(
  "./",
  ts.sys.fileExists,
  "tsconfig.json"
);
const fileContent = ts.readConfigFile(configurationFile, ts.sys.readFile);
const options = ts.parseJsonConfigFileContent(
  fileContent.config,
  ts.sys,
  "./"
);

Answer 2

By utilizing the following code snippet, I managed to effortlessly retrieve the compiler options.

Although I have not yet encountered any constraints, it appears to function smoothly while solely relying on resources provided by Typescript:

const configurationFile = ts.findConfigFile(
  "./",
  ts.sys.fileExists,
  "tsconfig.json"
);
const fileContent = ts.readConfigFile(configurationFile, ts.sys.readFile);
const options = ts.parseJsonConfigFileContent(
  fileContent.config,
  ts.sys,
  "./"
);

Answer 3

Answer №2

From my personal experience, attempting to pass any CompilerOptions can lead to numerous bugs and wasted time. What I found effective was simply passing an empty object as the CompilerOptions parameter. This was sufficient for obtaining diagnostics or AST data without any issues, unless there is a need for actual programmatic compilation.

However, if my memory serves me well, I recall successfully passing compiler options by reading tsconfig.json using JSON.encode(fs.readFileSync('./tsconfig.json'))

Answer 4

From my personal experience, attempting to pass any CompilerOptions can lead to numerous bugs and wasted time. What I found effective was simply passing an empty object as the CompilerOptions parameter. This was sufficient for obtaining diagnostics or AST data without any issues, unless there is a need for actual programmatic compilation.

However, if my memory serves me well, I recall successfully passing compiler options by reading tsconfig.json using JSON.encode(fs.readFileSync('./tsconfig.json'))

Answer 5

Answer №3

If you possess the tsconfig.json data, utilizing convertCompilerOptionsFromJson is a breeze.

Take this instance:

const compilerOpts = ts.convertCompilerOptionsFromJson({ module: 'commonjs', outDir: 'dist' }, '.');
console.log(compilerOpts);

The resulting output will be as follows:

{ options: { module: 1, outDir: 'dist' }, errors: [] }

Answer 6

If you possess the tsconfig.json data, utilizing convertCompilerOptionsFromJson is a breeze.

Take this instance:

const compilerOpts = ts.convertCompilerOptionsFromJson({ module: 'commonjs', outDir: 'dist' }, '.');
console.log(compilerOpts);

The resulting output will be as follows:

{ options: { module: 1, outDir: 'dist' }, errors: [] }

Ways to retrieve `CompilerOptions` from the `tsconfig.json` file

Answer №1

Answer №2

Answer №3

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