fix: Add types to memoized functions

packages/mermaid/src/utils.ts

@@ -561,8 +561,16 @@ export const drawSimpleText = function (
   return textElem;
 };
 
-export const wrapLabel = memoize(
-  (label, maxWidth, config) => {
+interface WrapLabelConfig {
+  fontSize: number;
+  fontFamily: string;
+  fontWeight: number;
+  joinWith: string;
+}
+
+export const wrapLabel: (label: string, maxWidth: string, config: WrapLabelConfig) => string =
+  memoize(
+    (label: string, maxWidth: string, config: WrapLabelConfig): string => {
       if (!label) {
         return label;
       }
@@ -601,14 +609,29 @@ export const wrapLabel = memoize(
       `${label}${maxWidth}${config.fontSize}${config.fontWeight}${config.fontFamily}${config.joinWith}`
   );
 
-const breakString = memoize(
-  (word, maxWidth, hyphenCharacter = '-', config) => {
+interface BreakStringOutput {
+  hyphenatedStrings: string[];
+  remainingWord: string;
+}
+
+const breakString: (
+  word: string,
+  maxWidth: number,
+  hyphenCharacter: string,
+  config: WrapLabelConfig
+) => BreakStringOutput = memoize(
+  (
+    word: string,
+    maxWidth: number,
+    hyphenCharacter = '-',
+    config: WrapLabelConfig
+  ): BreakStringOutput => {
     config = Object.assign(
       { fontSize: 12, fontWeight: 400, fontFamily: 'Arial', margin: 0 },
       config
     );
     const characters = word.split('');
-    const lines = [];
+    const lines: string[] = [];
     let currentLine = '';
     characters.forEach((character, index) => {
       const nextLine = `${currentLine}${character}`;
@@ -667,6 +690,16 @@ export function calculateTextWidth(
   return calculateTextDimensions(text, config).width;
 }
 
+interface TextDimensionConfig {
+  fontSize?: number;
+  fontWeight?: number;
+  fontFamily?: string;
+}
+interface TextDimensions {
+  width: number;
+  height: number;
+  lineHeight?: number;
+}
 /**
  * This calculates the dimensions of the given text, font size, font family, font weight, and
  * margins.
@@ -676,15 +709,11 @@ export function calculateTextWidth(
  *   the resulting size
  * @returns The dimensions for the given text
  */
-export const calculateTextDimensions = memoize(
-  function (
+export const calculateTextDimensions: (
   text: string,
-    config: {
-      fontSize?: number;
-      fontWeight?: number;
-      fontFamily?: string;
-    }
-  ) {
+  config: TextDimensionConfig
+) => TextDimensions = memoize(
+  (text: string, config: TextDimensionConfig): TextDimensions => {
     config = Object.assign({ fontSize: 12, fontWeight: 400, fontFamily: 'Arial' }, config);
     const { fontSize, fontFamily, fontWeight } = config;
     if (!text) {