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documentation/src/utils/split-code.ts

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+type SplitReturn = {
+    visible: string;
+    join: (code: string) => string;
+};
+
+/**
+ * This function will split code by the visible-block-start and visible-block-end comments and returns the visible block and join function.
+ * @param {string} code to be splitted by `// visible-block-start` and `// visible-block-end`
+ */
+export const splitCode = (code?: string): SplitReturn => {
+    const beginningComment = "// visible-block-start";
+    const endingComment = "// visible-block-end";
+
+    let beginning = code.indexOf(beginningComment);
+    beginning = beginning > 0 ? beginning + beginningComment.length : 0;
+
+    let ending = code.indexOf(endingComment);
+    ending = ending > 0 ? ending : code.length;
+
+    const aboveHidden = code.slice(0, beginning);
+    const visible = code.slice(beginning, ending).trimEnd().trimStart();
+    const belowHidden = code.slice(ending);
+
+    return {
+        visible,
+        join: (code: string) => `${aboveHidden}\n${code}\n${belowHidden}`,
+    };
+};