Roll up directly from .ts files so the source map relates back to the…

… original .ts files rather than the intermediary .js files

rollup.config.mjs

@@ -2,11 +2,16 @@ import dedent from 'dedent';
 import fs from 'fs';
 import { nodeResolve } from '@rollup/plugin-node-resolve';
 import rollupCommonjs from '@rollup/plugin-commonjs';
+import typescript from '@rollup/plugin-typescript';
 
 const pkg = JSON.parse(fs.readFileSync('./package.json', 'utf8'));
 
 export default {
-    input: './dist/es2015/autolinker.js',
+    // Roll up directly from the src .ts files so that the generated source map
+    // refers to the .ts files' contents rather than the intermediary .js files'
+    // contents (such as in the './dist/es2015' directory)
+    input: './src/autolinker.ts',
+
     output: {
         file: './dist/autolinker.js',
         format: 'umd',
@@ -29,6 +34,11 @@ export default {
             browser: true,
         }),
         rollupCommonjs(),
+        typescript({
+            compilerOptions: {
+                declaration: false, // don't need declaration files for the rolled up autolinker.js file
+            }
+        }),
     ],
     treeshake: true,
 };