Extract from devtools project

.editorconfig

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+root = true
+
+[*.{ts,json}]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+deno.d.ts
+.vscode
+.local

README.md

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+# typescript/system
+
+[![Build Status](https://thunderk.visualstudio.com/typescript/_apis/build/status/system?branchName=master)](https://dev.azure.com/thunderk/typescript/_build?pipelineNameFilter=system)
+
+## About
+
+Access to system ressources (files, network...).
+
+The Sys object exposed is compatible with the
+[Deno](https://doc.deno.land/builtin/stable) object, but its functions can be
+replaced by mocks.

deps.testing.ts

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+export {
+  describe,
+  expect,
+  it,
+  mock,
+} from "https://js.thunderk.net/testing@1.0.0/mod.ts";

doc/about.md

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+## About
+
+Access to system ressources (files, network...).
+
+The Sys object exposed is compatible with the
+[Deno](https://doc.deno.land/builtin/stable) object, but its functions can be
+replaced by mocks.

doc/index

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+about

mod.ts

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+export { Sys } from "./src/deno.ts";

run

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+#!/bin/sh
+# Simplified run tool for deno commands
+
+if test $# -eq 0
+then
+    echo "Usage: $0 [file or command]"
+    exit 1
+elif echo $1 | grep -q '.*.ts'
+then
+    denocmd=run
+    denoargs=$1
+    shift
+else
+    denocmd=$1
+    shift
+fi
+
+denoargs="$(cat config/$denocmd.flags 2> /dev/null) $denoargs $@"
+exec deno $denocmd $denoargs

src/deno.test.ts

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+import { Sys } from "./deno.ts";
+import { describe, expect, it, mock } from "../deps.testing.ts";
+
+describe("Sys", () => {
+  it("is mockable", () => {
+    function runSomething() {
+      Sys.run({ cmd: ["echo", "test"] });
+    }
+
+    expect(runSomething).toThrow(
+      'Requires run access to "echo", run again with the --allow-run flag',
+    );
+
+    mock(Sys, "run", undefined, (run) => {
+      runSomething();
+      expect(run).toHaveBeenCalledTimes(1);
+      expect(run).toHaveBeenCalledWith({ cmd: ["echo", "test"] });
+    });
+  });
+});

src/deno.ts

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+// Mockable Deno proxy
+export const Sys: typeof Deno = new Proxy({} as typeof Deno, {
+  get(obj: any, prop: keyof typeof Deno): any {
+    return obj.hasOwnProperty(prop) ? obj[prop] : Deno[prop];
+  },
+  set: function (obj: any, prop: keyof typeof Deno, value: any) {
+    obj[prop] = value;
+    return true;
+  },
+});

tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "esnext",
+    "target": "ESNext",
+    "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "preserveConstEnums": true
+  }
+}