feat(unstable): Workspaces support (#20410)

This commit adds unstable workspace support. This is extremely
bare-bones and
minimal first-pass at this.

With this change `deno.json` supports specifying `workspaces` key, that
accepts a list of subdirectories. Each workspace can have its own import
map. It's required to specify a `"name"` and `"version"` properties in the
configuration file for the workspace:

```jsonc
// deno.json
{
  "workspaces": [
     "a",
     "b"
  },
  "imports": {
    "express": "npm:express@5"
   }
}
```
``` jsonc
// a/deno.json
{
  "name": "a",
  "version": "1.0.2",
  "imports": {
    "kleur": "npm:kleur"
  }
}
```
```jsonc
// b/deno.json
{
  "name": "b",
  "version": "0.51.0",
  "imports": {
    "chalk": "npm:chalk"
  }
}
```

`--unstable-workspaces` flag is required to use this feature:
```
$ deno run --unstable-workspaces mod.ts
```

---------

Co-authored-by: David Sherret <dsherret@gmail.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index c24464eba..306d4df67 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -4759,3 +4759,32 @@ itest!(explicit_resource_management {
   args: "run --quiet --check run/explicit_resource_management/main.ts",
   output: "run/explicit_resource_management/main.out",
 });
+
+itest!(workspaces_basic {
+  args: "run -L debug -A --unstable-workspaces main.ts",
+  output: "run/workspaces/basic/main.out",
+  cwd: Some("run/workspaces/basic/"),
+  copy_temp_dir: Some("run/workspaces/basic/"),
+  envs: env_vars_for_npm_tests(),
+  http_server: true,
+});
+
+itest!(workspaces_member_outside_root_dir {
+  args: "run -A --unstable-workspaces main.ts",
+  output: "run/workspaces/member_outside_root_dir/main.out",
+  cwd: Some("run/workspaces/member_outside_root_dir/"),
+  copy_temp_dir: Some("run/workspaces/member_outside_root_dir/"),
+  envs: env_vars_for_npm_tests(),
+  http_server: true,
+  exit_code: 1,
+});
+
+itest!(workspaces_nested_member {
+  args: "run -A --unstable-workspaces main.ts",
+  output: "run/workspaces/nested_member/main.out",
+  cwd: Some("run/workspaces/nested_member/"),
+  copy_temp_dir: Some("run/workspaces/nested_member/"),
+  envs: env_vars_for_npm_tests(),
+  http_server: true,
+  exit_code: 1,
+});