fix: include original source location. Fixes #24

examples/karma-ts/.gitignore

@@ -0,0 +1,2 @@
+dist/
+coverage/

examples/karma-ts/karma.conf.js

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+const istanbul = require("rollup-plugin-istanbul")
+const typescript = require("@rollup/plugin-typescript")
+
+module.exports = (config) => {
+	config.set({
+		// It seems that plugins are not loaded automatically using PNPM
+		plugins: [
+			require("karma-rollup-preprocessor"),
+			require("karma-mocha"),
+			require("karma-mocha-reporter"),
+			require("karma-chai"),
+			require("karma-coverage"),
+			require("karma-jsdom-launcher"),
+		],
+		basePath: "./",
+		frameworks: ["mocha", "chai"],
+		files: [{ pattern: "spec/**/*.spec.ts", watched: false }],
+		preprocessors: {
+			"spec/**/*.spec.ts": ["rollup"],
+		},
+		reporters: ["mocha", "coverage"],
+
+		browsers: ["jsdom"],
+
+		rollupPreprocessor: {
+			plugins: [
+				typescript(),
+				istanbul({
+					exclude: ["spec/**/*.spec.ts"],
+					sourceMap: true,
+					instrumenterConfig: {
+						produceSourceMap: true,
+					},
+				}),
+			],
+			output: {
+				format: "iife",
+				sourcemap: "inline",
+			},
+		},
+
+		coverageReporter: {
+			dir: "coverage",
+			includeAllSources: true,
+			reporters: [
+				{ type: "text" },
+				{ type: "html", subdir: "html" },
+				{ type: "lcov", subdir: "./" },
+			],
+		},
+	})
+}

examples/karma-ts/package.json

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+{
+	"name": "rollup-plugin-istanbul-karma-example",
+	"version": "1.0.0",
+	"description": "",
+	"main": "index.js",
+	"scripts": {
+		"clean": "rm -rf dist/*",
+		"build": "rollup -c",
+		"test": "karma start --single-run"
+	},
+	"author": {
+		"name": "Alberto Varela",
+		"email": "hello@albertovarela.net",
+		"url": "https://www.albertovarela.net"
+	},
+	"license": "MIT",
+	"devDependencies": {
+		"@rollup/plugin-typescript": "^9.0.2",
+		"@types/chai": "^4.3.3",
+		"@types/mocha": "^10.0.0",
+		"chai": "^4.2.0",
+		"jsdom": "^20.0.2",
+		"karma": "^6.4.1",
+		"karma-chai": "^0.1.0",
+		"karma-coverage": "^2.0.3",
+		"karma-jsdom-launcher": "^13.0.0",
+		"karma-mocha": "^2.0.1",
+		"karma-mocha-reporter": "^2.2.5",
+		"karma-rollup-preprocessor": "^7.0.5",
+		"mocha": "^10.1.0",
+		"rollup": "^3.2.5",
+		"rollup-plugin-istanbul": "file:../..",
+		"tslib": "^2.4.1",
+		"typescript": "^4.8.4"
+	}
+}