lowerExpression() — react Function Reference

Source Code

compiler/packages/babel-plugin-react-compiler/src/HIR/BuildHIR.ts lines 1545–2675

function lowerExpression(
  builder: HIRBuilder,
  exprPath: NodePath<t.Expression>,
): InstructionValue {
  const exprNode = exprPath.node;
  const exprLoc = exprNode.loc ?? GeneratedSource;
  switch (exprNode.type) {
    case 'Identifier': {
      const expr = exprPath as NodePath<t.Identifier>;
      const place = lowerIdentifier(builder, expr);
      return {
        kind: getLoadKind(builder, expr),
        place,
        loc: exprLoc,
      };
    }
    case 'NullLiteral': {
      return {
        kind: 'Primitive',
        value: null,
        loc: exprLoc,
      };
    }
    case 'BooleanLiteral':
    case 'NumericLiteral':
    case 'StringLiteral': {
      const expr = exprPath as NodePath<
        t.StringLiteral | t.BooleanLiteral | t.NumericLiteral
      >;
      const value = expr.node.value;
      return {
        kind: 'Primitive',
        value,
        loc: exprLoc,
      };
    }
    case 'ObjectExpression': {
      const expr = exprPath as NodePath<t.ObjectExpression>;
      const propertyPaths = expr.get('properties');
      const properties: Array<ObjectProperty | SpreadPattern> = [];
      for (const propertyPath of propertyPaths) {
        if (propertyPath.isObjectProperty()) {
          const loweredKey = lowerObjectPropertyKey(builder, propertyPath);
          if (!loweredKey) {
            continue;
          }
          const valuePath = propertyPath.get('value');
          if (!valuePath.isExpression()) {
            builder.errors.push({
              reason: `(BuildHIR::lowerExpression) Handle ${valuePath.type} values in ObjectExpression`,
              category: ErrorCategory.Todo,
              loc: valuePath.node.loc ?? null,
              suggestions: null,
            });
            continue;
          }
          const value = lowerExpressionToTemporary(builder, valuePath);
          properties.push({
            kind: 'ObjectProperty',
            type: 'property',
            place: value,
            key: loweredKey,
          });
        } else if (propertyPath.isSpreadElement()) {
          const place = lowerExpressionToTemporary(
            builder,
            propertyPath.get('argument'),
          );
          properties.push({
            kind: 'Spread',
            place,
          });
        } else if (propertyPath.isObjectMethod()) {
          if (propertyPath.node.kind !== 'method') {
            builder.errors.push({
              reason: `(BuildHIR::lowerExpression) Handle ${propertyPath.node.kind} functions in ObjectExpression`,
              category: ErrorCategory.Todo,
              loc: propertyPath.node.loc ?? null,
              suggestions: null,
            });
            continue;