Create eslint plugin

[NullVoxPopuli]

Goal is to help folks out with issues like what is reported here: #707

Todo: Lints for

• warn: short circuiting logic can prevent other data from ever being consumed

  if (foo && bar) { /* ... */ }

  in this situation, if both foo and bar are tracked, and foo is always false, the resource will never add bar to it's list of reactive dependencies

• against: setting variables on this within a resource

  • docs and explanation
  • within trackedFunction

    class Demo {
      // ❌ bad
      /* ... */ = trackedFunction(() => {
        this.prop = 1;
        /* ... */
      });
    }

  • within resource()

    class Demo {
      // ❌ bad
      /* ... */ = resource(() => {
        this.prop = 1;
        /* ... */
      });
    }

  • within argument thunk (args to a resource blueprint/factory/from)

    class Demo {
      // ❌ bad
      /* ... */ = MyResource.from(() => {
        this.prop = 1;
        return [ ... ];
      });
      // ❌ bad
      /* ... */ = RemoteData(() => {
        this.prop = 1;
        return 'https://...';
      });
    }

• against: setting tracked state after the state was created (unless inside an awaited IIFE)

  class Demo {
    // ❌ bad
    /* ... */ = resource(() => {
      let state = new TrackedObject();
      state.data = 2
      /* ... */
    });
  
    // ✅ good
    /* ... */ = resource(() => {
      let state = new TrackedObject({ data: 2 });
        
      /* ... */
    });
  
    // ✅ good
    /* ... */ = resource(() => {
      let state = new TrackedObject();
        
      (async () => {
        state.data = 2        
      })();
      /* ... */
    });
  
    }

• autofix: if this is accessed after an await, suggested and fix with destroyable protection (if isDestroyed || isDestroying) -- see also: Propose new rule: no-unsafe-this-access ember-cli/eslint-plugin-ember#1421

 class Demo {
   // ❌ bad
   /* ... */ = resource(() => {
     (async () => {
       await Promise.resolve();
       let foo = this.foo;
     })();
     /* ... */
   });

   // ✅ good
   /* ... */ = resource(() => {
     (async () => {
       await Promise.resolve();
       if (isDestroying(this) || isDestroyed(this)) return;

       let foo = this.foo;
     })();        
     /* ... */
   });

Stretch goal lints

• against: if a function call within a resource is within the same file, and if it sets properties on this

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🦋 Changeset detected

Latest commit: 566d0e2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
eslint-plugin-ember-resources	Major

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Estimated impact to a consuming app, depending on which bundle is imported

	js	min	min + gzip	min + brotli
/index.js	13.97 kB	3.33 kB	1.36 kB	1.2 kB
├── core/class-based/index.js	4.43 kB	1.88 kB	929 B	798 B
├── core/function-based/index.js	6.03 kB	552 B	269 B	213 B
└── core/use.js	2.91 kB	415 B	256 B	203 B
/util/cell.js	2.28 kB	917 B	434 B	366 B
/util/debounce.js	2.64 kB	771 B	409 B	340 B
/util/ember-concurrency.js	4.33 kB	1.53 kB	733 B	626 B
/util/function-resource.js	216 B	154 B	123 B	87 B
/util/function.js	4.82 kB	2.99 kB	1.05 kB	905 B
/util/helper.js	1.79 kB	303 B	218 B	177 B
/util/keep-latest.js	1.75 kB	512 B	296 B	235 B
/util/map.js	5.19 kB	2.13 kB	918 B	794 B
/util/remote-data.js	4.86 kB	1.75 kB	675 B	596 B