Function validateBrowserExpression

packages/compiler-core/src/validateExpression.ts:28–65

(
  node: SimpleExpressionNode,
  context: TransformContext,
  asParams = false,
  asRawStatements = false,
)

 * doesn't prefix expressions.
 */
export function validateBrowserExpression(
  node: SimpleExpressionNode,
  context: TransformContext,
  asParams = false,
  asRawStatements = false,
): void {
  const exp = node.content

  // empty expressions are validated per-directive since some directives
  // do allow empty expressions.
  if (!exp.trim()) {
    return
  }

  try {
    new Function(
      asRawStatements
        ? ` ${exp} `
        : `return ${asParams ? `(${exp}) => {}` : `(${exp})`}`,
    )
  } catch (e: any) {
    let message = e.message
    const keywordMatch = exp
      .replace(stripStringRE, '')
      .match(prohibitedKeywordRE)
    if (keywordMatch) {
      message = `avoid using JavaScript keyword as property name: "${keywordMatch[0]}"`
    }
    context.onError(
      createCompilerError(
        ErrorCodes.X_INVALID_EXPRESSION,
        node.loc,
        undefined,
        message,
      ),
    )
  }
}