Function evaluateConstant

packages/compiler-dom/src/transforms/stringifyStatic.ts:403–423

(exp: ExpressionNode)

// run JSFuck in here. But we mark it unsafe for security review purposes.
// (see compiler-core/src/transforms/transformExpression)
function evaluateConstant(exp: ExpressionNode): string {
  if (exp.type === NodeTypes.SIMPLE_EXPRESSION) {
    return new Function(`return (${exp.content})`)()
  } else {
    // compound
    let res = ``
    exp.children.forEach(c => {
      if (isString(c) || isSymbol(c)) {
        return
      }
      if (c.type === NodeTypes.TEXT) {
        res += c.content
      } else if (c.type === NodeTypes.INTERPOLATION) {
        res += toDisplayString(evaluateConstant(c.content))
      } else {
        res += evaluateConstant(c as ExpressionNode)
      }
    })
    return res
  }
}