Adding test checks.

packages/string-templates/src/environment.ts

@@ -0,0 +1,11 @@
+function isJest() {
+  return (
+    process.env.NODE_ENV === "jest" ||
+    (process.env.JEST_WORKER_ID != null &&
+      process.env.JEST_WORKER_ID !== "null")
+  )
+}
+
+export function isTest() {
+  return isJest()
+}

packages/string-templates/src/helpers/javascript.ts

@@ -10,6 +10,7 @@ import { iifeWrapper } from "../iife"
 import { JsTimeoutError, UserScriptError } from "../errors"
 import { cloneDeep } from "lodash/fp"
 import { Log, LogType } from "../types"
+import { isTest } from "../environment"
 
 // The method of executing JS scripts depends on the bundle being built.
 // This setter is used in the entrypoint (either index.js or index.mjs).
@@ -126,7 +127,9 @@ export function processJS(handlebars: string, context: any) {
       const jsLineCount = frontendWrapJS(js).split(js)[0].split("\n").length
       const buildLogResponse = (type: LogType) => {
         return (...props: any[]) => {
+          if (!isTest()) {
             console[type](...props)
+          }
           props.forEach((prop, index) => {
             if (typeof prop === "object") {
               props[index] = JSON.stringify(prop)

packages/string-templates/test/jsLogging.spec.ts

@@ -43,4 +43,11 @@ describe("Javascript", () => {
     expect(output.logs[0].line).toEqual(1)
     expect(output.logs[0].type).toEqual("warn")
   })
+
+  it("should return the type working with error", () => {
+    const output = processJS(`console.error("error"); return 1`)
+    expect(output.logs[0].log).toEqual(["error"])
+    expect(output.logs[0].line).toEqual(1)
+    expect(output.logs[0].type).toEqual("error")
+  })
 })