Function getPathAlias

getPathAlias(
tsconfig: { compilerOptions: { paths: Record<string, string[]> } },
rootDir: string,
): Record<string, string>
Converts a TypeScript compilerOptions.paths map into a Vitest-compatible alias map.

Each path alias key (e.g. @app/*) is stripped of its trailing /* and mapped to the resolved absolute path of the first entry in its value array.
Parameters
- tsconfig: { compilerOptions: { paths: Record<string, string[]> } }
  A partial tsconfig object containing compilerOptions.paths
- rootDir: string
  The root directory used to resolve relative path values
Returns Record<string, string>
A record mapping alias names to absolute filesystem paths
Throws
Error If an alias entry has an empty path array
Example
```
// vitest.config.ts
import { defineProject, mergeConfig } from 'vitest/config';
import { getPathAlias } from '@map-colonies/vitest-utils';
import tsconfigJson from './tsconfig.json';

export default mergeConfig(
  sharedConfig,
  defineProject({
    resolve: {
      alias: getPathAlias(tsconfigJson, __dirname),
    },
  })
);
```
- Defined in pathAlias.ts:33