diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20bc209d..ddde3942 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # changelog
 
- * 1.9.5
+ * 1.9.6 _Aug.19.2022_
+   * support parent url to facilitate sourcemap usage, [113](https://github.com/iambumblehead/esmock/issues/113)
+ * 1.9.5 _Aug.19.2022_
    * support cjs packges that define [main relative directory only](https://github.com/iambumblehead/esmock/issues/119)
  * 1.9.4 _Aug.15.2022_
    * support core modules [w/ node: prefix](https://github.com/iambumblehead/resolvewithplus/pull/27), credit @gmahomarf
diff --git a/package.json b/package.json
index a984b61b..d6db42dd 100644
--- a/package.json
+++ b/package.json
@@ -69,6 +69,7 @@
     "test-ci": "npm run test:install && npm run test:all-ci",
     "test-cover": "npm run test:install && c8 npm run test:all",
     "lint": "eslint .",
+    "lint-fix": "eslint --fix .",
     "mini:pkg": "npm pkg delete scripts devDependencies",
     "prepublishOnly": "npm run lint && npm run test-ci && npm run mini:pkg"
   }
diff --git a/src/esmock.d.ts b/src/esmock.d.ts
index ac3352b7..1eaab502 100644
--- a/src/esmock.d.ts
+++ b/src/esmock.d.ts
@@ -1,2 +1,76 @@
-declare function esmock(path: string, localmock?: any, globalmock?: any): any;
+/**
+ * Mocks imports for the module specified by {@link modulePath}.
+ *
+ * The provided mocks replace the imported modules _fully_.
+ *
+ * @param modulePath The module whose imports will be mocked.
+ * @param parent A URL to resolve specifiers relative to; typically `import.meta.url`.
+ *               If not specified, it will be inferred via the stack, which may not work
+ *               if source maps are in use.
+ * @param mockDefs A mapping of import specifiers to mocked module objects; these mocks will
+ *                 only be used for imports resolved in the module specified by {@link modulePath}.
+ * @param globalDefs A mapping of import specifiers to mocked module objects; these mocks will
+ *                   apply to imports within the module specified by {@link modulePath}, as well
+ *                   as any transitively imported modules.
+ * @param opt
+ * @returns The result of importing {@link modulePath}, similar to `import(modulePath)`.
+ */
+declare function esmock(modulePath: string, parent: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+declare function esmock(modulePath: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+
+declare namespace esmock {
+  interface Options {
+    partial?: boolean | undefined;
+    purge?: boolean | undefined;
+  }
+
+  /**
+   * Mocks imports for the module specified by {@link modulePath}.
+   *
+   * The provided mocks replace the imported modules _partially_, allowing some exports to
+   * be overridden while the rest are provided by the real module.
+   *
+   * @param modulePath The module whose imports will be mocked.
+   * @param parent A URL to resolve specifiers relative to; typically `import.meta.url`.
+   *               If not specified, it will be inferred via the stack, which may not work
+   *               if source maps are in use.
+   * @param mockDefs A mapping of import specifiers to mocked module objects; these mocks will
+   *                 only be used for imports resolved in the module specified by {@link modulePath}.
+   * @param globalDefs A mapping of import specifiers to mocked module objects; these mocks will
+   *                   apply to imports within the module specified by {@link modulePath}, as well
+   *                   as any transitively imported modules.
+   * @param opt
+   * @returns The result of importing {@link modulePath}, similar to `import(modulePath)`.
+   */
+  function px(modulePath: string, parent: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+  function px(modulePath: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+
+  /**
+   * Mocks dynamic imports for the module specified by {@link modulePath}.
+   *
+   * After using this function, consider calling {@link esmock.purge} to free memory.
+   *
+   * @param modulePath The module whose imports will be mocked.
+   * @param parent A URL to resolve specifiers relative to; typically `import.meta.url`.
+   *               If not specified, it will be inferred via the stack, which may not work
+   *               if source maps are in use.
+   * @param mockDefs A mapping of import specifiers to mocked module objects; these mocks will
+   *                 only be used for imports resolved in the module specified by {@link modulePath}.
+   * @param globalDefs A mapping of import specifiers to mocked module objects; these mocks will
+   *                   apply to imports within the module specified by {@link modulePath}, as well
+   *                   as any transitively imported modules.
+   * @param opt
+   * @returns The result of importing {@link modulePath}, similar to `import(modulePath)`.
+   */
+  function p(modulePath: string, parent: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+  function p(modulePath: string, mockDefs?: Record<string, any>, globalDefs?: Record<string, any>, opt?: esmock.Options): any;
+
+  /**
+   * Unregisters a dynamic mock created by {@link esmock.p}.
+   *
+   * @param mockModule A module object that was previously returned by {@link esmock.p}.
+   */
+  function purge(mockModule: any): void;
+}
+
 export default esmock;
diff --git a/src/esmock.js b/src/esmock.js
index f868eaa3..f81f486f 100644
--- a/src/esmock.js
+++ b/src/esmock.js
@@ -8,8 +8,21 @@ import {
   esmockCache
 } from './esmockCache.js'
 
-const esmock = async (modulePath, mockDefs, globalDefs, opt = {}, err) => {
-  const calleePath = (err || new Error).stack.split('\n')[2]
+const argsToObj = args => {
+  // Distinguish between the two overloads; see esmock.d.ts.
+  let modulePath, parent, mockDefs, globalDefs, opt
+  if (typeof args[1] === "string") {
+    [ modulePath, parent, mockDefs, globalDefs, opt ] = args
+  } else {
+    [ modulePath, mockDefs, globalDefs, opt ] = args
+  }
+  return { modulePath, parent, mockDefs, globalDefs, opt }
+}
+
+const _esmock = async (argsObj, err) => {
+  const { modulePath, parent, mockDefs, globalDefs, opt = {} } = argsObj
+
+  const calleePath = (parent || err.stack.split('\n')[2])
     .replace(/^.*file:\/\//, '') // rm every before filepath
     .replace(/:[\d]*:[\d]*.*$/, '') // rm line and row number
     .replace(/^.*:/, '') // rm windows-style drive location
@@ -29,11 +42,19 @@ const esmock = async (modulePath, mockDefs, globalDefs, opt = {}, err) => {
   return esmockModuleImportedSanitize(importedModule, modulePathKey)
 }
 
-esmock.px = async (modulePath, mockDefs, globalDefs, opt) => esmock(
-  modulePath, mockDefs, globalDefs, { ...opt, partial: true }, new Error)
+const esmock = async (...args) => _esmock(argsToObj(args), new Error)
 
-esmock.p = async (modulePath, mockDefs, globalDefs, opt) => esmock(
-  modulePath, mockDefs, globalDefs, { ...opt, purge: false }, new Error)
+esmock.px = async (...args) => {
+  const argsObj = argsToObj(args)
+  argsObj.opt = { ...argsObj.opt, partial: true }
+  return _esmock(argsObj, new Error)
+}
+
+esmock.p = async (...args) => {
+  const argsObj = argsToObj(args)
+  argsObj.opt = { ...argsObj.opt, purge: false }
+  return _esmock(argsObj, new Error)
+}
 
 esmock.purge = mockModule => {
   if (mockModule && /object|function/.test(typeof mockModule)
diff --git a/tests/package.json b/tests/package.json
index bd4f23ff..86a0c9c4 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -7,6 +7,10 @@
     "url": "https://github.com/iambumblehead/esmock.git"
   },
   "main": "package.json.esmock.export.js",
+  "exports": {
+    "types": "./package.json.esmock.export.d.ts",
+    "import": "./package.json.esmock.export.js"
+  },  
   "dependencies": {
     "pg": "^8.7.3",
     "eslint": "^8.12.0",
@@ -27,6 +31,7 @@
     "install:test-tsm": "cd tests-tsm && npm install",
     "install:test-node": "cd tests-node && npm install",
     "install:test-jest": "cd tests-jest && npm install",
+    "install:test-source-map": "cd tests-source-map && npm install",
     "install:test-nodets": "cd tests-nodets && npm install",
     "install:all": "node --version && npm install && npm-run-all install:test*",
     "test:test-ava": "cd tests-ava && npm test",
@@ -35,6 +40,7 @@
     "test:node18-test-node": "cd tests-node && npm test",
     "test:node18-test-jest": "cd tests-jest && npm test",
     "test:node18-test-nodets": "cd tests-nodets && npm test",
+    "test:node18-test-source-map": "cd tests-source-map && npm test",
     "test:node18:all": "npm run isnodelt18 || npm-run-all test:node18-test*",
     "test:all": "npm-run-all test:test* && npm run test:node18:all",
     "test:all-cover": "c8 --src=../src/* npm run test:all",
diff --git a/tests/package.json.esmock.export.d.ts b/tests/package.json.esmock.export.d.ts
new file mode 100644
index 00000000..347022d7
--- /dev/null
+++ b/tests/package.json.esmock.export.d.ts
@@ -0,0 +1,3 @@
+import esmock from "../src/esmock.js";
+
+export default esmock;
diff --git a/tests/tests-source-map/.gitignore b/tests/tests-source-map/.gitignore
new file mode 100644
index 00000000..53c37a16
--- /dev/null
+++ b/tests/tests-source-map/.gitignore
@@ -0,0 +1 @@
+dist
\ No newline at end of file
diff --git a/tests/tests-source-map/README.md b/tests/tests-source-map/README.md
new file mode 100644
index 00000000..5c6ec491
--- /dev/null
+++ b/tests/tests-source-map/README.md
@@ -0,0 +1,7 @@
+# esmock-source-map-bug
+
+To run with source maps, run `npm run test`. esmock would previously fail unless the provided module path was absolute
+
+To run without source maps, run `npm run test-no-maps`. This works.
+
+https://github.com/iambumblehead/esmock/issues/113
diff --git a/tests/tests-source-map/package.json b/tests/tests-source-map/package.json
new file mode 100644
index 00000000..b32cfc1c
--- /dev/null
+++ b/tests/tests-source-map/package.json
@@ -0,0 +1,34 @@
+{
+  "type": "module",
+  "description": "esmock unit tests, ava with sourcemap",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/iambumblehead/esmock.git"
+  },
+  "dependencies": {
+    "esmock": "file:..",
+    "@ava/typescript": "^3.0.1",
+    "@tsconfig/node14": "^1.0.3",
+    "@types/node": "^18.7.3",
+    "ava": "^4.3.1",
+    "cross-env": "^7.0.3",
+    "rimraf": "^3.0.2",
+    "typescript": "^4.7.4"
+  },
+  "scripts": {
+    "test": "rimraf dist && tsc && cross-env NODE_OPTIONS=--loader=esmock NODE_NO_WARNINGS=1 ava",
+    "test-no-maps": "rimraf dist && tsc --sourceMap false && cross-env NODE_OPTIONS=--loader=esmock NODE_NO_WARNINGS=1 ava"
+  },
+  "ava": {
+    "typescript": {
+      "rewritePaths": {
+        "src/": "dist/"
+      },
+      "compile": false
+    },
+    "environmentVariables": {
+      "NO_COLOR": "1",
+      "FORCE_COLOR": "0"
+    }
+  }
+}
diff --git a/tests/tests-source-map/src/__tests__/index.test.ts b/tests/tests-source-map/src/__tests__/index.test.ts
new file mode 100644
index 00000000..04a32f70
--- /dev/null
+++ b/tests/tests-source-map/src/__tests__/index.test.ts
@@ -0,0 +1,30 @@
+import test from "ava";
+import esmock from "esmock";
+import { fileURLToPath } from "url";
+
+import type * as indexType from "../index.js";
+
+const expectedHostname = "my-machine";
+
+test("using absolute path", async (t) => {
+    const urlFull = fileURLToPath(new URL("../index.js", import.meta.url));
+    const indexModule = await esmock(urlFull, {
+        os: {
+            hostname: () => expectedHostname,
+        },
+    });
+
+    const getHostname: typeof indexType.getHostname = indexModule.getHostname;
+    t.is(getHostname(), expectedHostname);
+});
+
+test("using relative path", async (t) => {
+    const indexModule = await esmock("../index.js", import.meta.url, {
+        os: {
+            hostname: () => expectedHostname,
+        },
+    });
+
+    const getHostname: typeof indexType.getHostname = indexModule.getHostname;
+    t.is(getHostname(), expectedHostname);
+});
diff --git a/tests/tests-source-map/src/index.ts b/tests/tests-source-map/src/index.ts
new file mode 100644
index 00000000..77f829d5
--- /dev/null
+++ b/tests/tests-source-map/src/index.ts
@@ -0,0 +1,5 @@
+import os from "os";
+
+export function getHostname() {
+    return os.hostname();
+}
diff --git a/tests/tests-source-map/tsconfig.json b/tests/tests-source-map/tsconfig.json
new file mode 100644
index 00000000..061d11dd
--- /dev/null
+++ b/tests/tests-source-map/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "extends": "@tsconfig/node14/tsconfig.json",
+    "compilerOptions": {
+        "module": "Node16",
+        "moduleResolution": "Node16",
+        "rootDir": "src",
+        "outDir": "dist",
+        "declarationDir": "dist",
+        "declaration": true,
+        "stripInternal": true,
+        "sourceMap": true,
+
+        "allowUnusedLabels": false,
+        "allowUnreachableCode": false,
+        "exactOptionalPropertyTypes": true,
+        "noFallthroughCasesInSwitch": true,
+        "noImplicitOverride": true,
+        "noImplicitReturns": true,
+        "noPropertyAccessFromIndexSignature": true,
+        "importsNotUsedAsValues": "error"
+    },
+    "exclude": ["dist"]
+}