Repository: facebook/react
File: compiler/packages/babel-plugin-react-compiler/src/Inference/InferMutationAliasingEffects.ts (TypeScript)

Code before:
      });
      state.define(effect.into, effect.function);
      for (const capture of effect.captures) {
        applyEffect(
          context,
          state,
          {
            kind: 'Capture',
            from: capture,
            into: effect.into,
          },
          initialized,
          effects,
        );
      }
      break;
    }
    case 'MaybeAlias':
    case 'Alias':
    case 'Capture': {
      CompilerError.invariant(
        effect.kind === 'Capture' ||
          effect.kind === 'MaybeAlias' ||
          initialized.has(effect.into.identifier.id),
        {
          reason: `Expected destination value to already be initialized within this instruction for Alias effect`,
          description: `Destination ${printPlace(effect.into)} is not initialized in this instruction`,
          details: [
            {
              kind: 'error',
              loc: effect.into.loc,
              message: null,
            },
          ],
        },
      );
      /*
       * Capture describes potential information flow: storing a pointer to one value
       * within another. If the destination is not mutable, or the source value has
       * copy-on-write semantics, then we can prune the effect
       */
      const intoKind = state.kind(effect.into).kind;
      let destinationType: 'context' | 'mutable' | null = null;
      switch (intoKind) {
        case ValueKind.Context: {
          destinationType = 'context';
          break;
        }
        case ValueKind.Mutable:
        case ValueKind.MaybeFrozen: {
          destinationType = 'mutable';

Review comment (suggestion):
minor nit, should we update the reason or move into description?
```suggestion
          reason: `Expected destination value to already be initialized within this instruction for ${effect.kind} effect`,
```

Code after:
      });
      state.define(effect.into, effect.function);
      for (const capture of effect.captures) {
        applyEffect(
          context,
          state,
          {
            kind: 'Capture',
            from: capture,
            into: effect.into,
          },
          initialized,
          effects,
        );
      }
      break;
    }
    case 'MaybeAlias':
    case 'Alias':
    case 'Capture': {
      CompilerError.invariant(
        effect.kind === 'Capture' ||
          effect.kind === 'MaybeAlias' ||
          initialized.has(effect.into.identifier.id),
        {
          reason: `Expected destination to already be initialized within this instruction`,
          description:
            `Destination ${printPlace(effect.into)} is not initialized in this ` +
            `instruction for effect ${printAliasingEffect(effect)}`,
          details: [
            {
              kind: 'error',
              loc: effect.into.loc,
              message: null,
            },
          ],
        },
      );
      /*
       * Capture describes potential information flow: storing a pointer to one value
       * within another. If the destination is not mutable, or the source value has
       * copy-on-write semantics, then we can prune the effect
       */
      const intoKind = state.kind(effect.into).kind;
      let destinationType: 'context' | 'mutable' | null = null;
      switch (intoKind) {
        case ValueKind.Context: {
          destinationType = 'context';
          break;
        }
        case ValueKind.Mutable: