When set, TypeScript will include the original content of the .ts file as an embedded string in the source map (using the source map's sourcesContent property). This is often useful in the same cases as inlineSourceMap.

Requires either sourceMap or inlineSourceMap to be set.

For example, with this TypeScript:

const helloWorld = "hi";
console.log(helloWorld);

const helloWorld = "hi";
console.log(helloWorld);

By default converts to this JavaScript:

// @showEmit
const helloWorld = "hi";
console.log(helloWorld);

// @showEmit
const helloWorld = "hi";
console.log(helloWorld);

Then enable building it with inlineSources and inlineSourceMap enabled there is a comment at the bottom of the file which includes a source-map for the file. Note that the end is different from the example in inlineSourceMap because the source-map now contains the original source code also.

// @inlineSources
// @inlineSourceMap
// @showEmit
const helloWorld = "hi";
console.log(helloWorld);

// @inlineSources
// @inlineSourceMap
// @showEmit
const helloWorld = "hi";
console.log(helloWorld);