Function wrapStringTemplate

ts/workflow-core/src/expression/parser.ts:350–365

* Wrap bare text in a string-type expression into quoted string literals for jsep. * Splits by variable placeholders (__varN__), quotes text segments, joins with +. * E.g. `hello __var0__` → `"hello " + __var0__`

(expr: string)

  if (from === "image") return false;
  if (to === "string") return true;
  return false;
}

/**
 * Wrap bare text in a string-type expression into quoted string literals for jsep.
 * Splits by variable placeholders (__varN__), quotes text segments, joins with +.
 * E.g. `hello __var0__` → `"hello " + __var0__`
 */
function wrapStringTemplate(expr: string): string {
  // Split by __varN__ placeholders but keep them as delimiters
  const parts = expr.split(/(__var\d+__)/);
  const segments: string[] = [];

  for (const part of parts) {
    if (/^__var\d+__$/.test(part)) {
      segments.push(part);
    } else if (part !== "") {
      const escaped = part.replace(/\\/g, "\\\\").replace(/"/g, '\\"');
      segments.push(`"${escaped}"`);