...
More details are available as part of the official Webpack documentation: https://webpack.js.org/configuration/devtool/
Typescript (tsc)
Add the relevant compiler option --sourceMap or --inlineSourceMap to the command line or to your tsconfig.json
More details are available as part of the official Typescript documentation: https://www.typescriptlang.org/docs/handbook/compiler-options.html#compiler-options