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backend/node_modules/@tailwindcss/line-clamp/jest/customMatchers.js

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+const prettier = require('prettier')
+const { diff } = require('jest-diff')
+
+function format(input) {
+  return prettier.format(input, {
+    parser: 'css',
+    printWidth: 100,
+  })
+}
+
+expect.extend({
+  // Compare two CSS strings with all whitespace removed
+  // This is probably naive but it's fast and works well enough.
+  toMatchCss(received, argument) {
+    function stripped(str) {
+      return str.replace(/\s/g, '').replace(/;/g, '')
+    }
+
+    const options = {
+      comment: 'stripped(received) === stripped(argument)',
+      isNot: this.isNot,
+      promise: this.promise,
+    }
+
+    const pass = stripped(received) === stripped(argument)
+
+    const message = pass
+      ? () => {
+          return (
+            this.utils.matcherHint('toMatchCss', undefined, undefined, options) +
+            '\n\n' +
+            `Expected: not ${this.utils.printExpected(format(received))}\n` +
+            `Received: ${this.utils.printReceived(format(argument))}`
+          )
+        }
+      : () => {
+          const actual = format(received)
+          const expected = format(argument)
+
+          const diffString = diff(expected, actual, {
+            expand: this.expand,
+          })
+
+          return (
+            this.utils.matcherHint('toMatchCss', undefined, undefined, options) +
+            '\n\n' +
+            (diffString && diffString.includes('- Expect')
+              ? `Difference:\n\n${diffString}`
+              : `Expected: ${this.utils.printExpected(expected)}\n` +
+                `Received: ${this.utils.printReceived(actual)}`)
+          )
+        }
+
+    return { actual: received, message, pass }
+  },
+  toIncludeCss(received, argument) {
+    const options = {
+      comment: 'stripped(received).includes(stripped(argument))',
+      isNot: this.isNot,
+      promise: this.promise,
+    }
+
+    const actual = format(received)
+    const expected = format(argument)
+
+    const pass = actual.includes(expected)
+
+    const message = pass
+      ? () => {
+          return (
+            this.utils.matcherHint('toIncludeCss', undefined, undefined, options) +
+            '\n\n' +
+            `Expected: not ${this.utils.printExpected(format(received))}\n` +
+            `Received: ${this.utils.printReceived(format(argument))}`
+          )
+        }
+      : () => {
+          const diffString = diff(expected, actual, {
+            expand: this.expand,
+          })
+
+          return (
+            this.utils.matcherHint('toIncludeCss', undefined, undefined, options) +
+            '\n\n' +
+            (diffString && diffString.includes('- Expect')
+              ? `Difference:\n\n${diffString}`
+              : `Expected: ${this.utils.printExpected(expected)}\n` +
+                `Received: ${this.utils.printReceived(actual)}`)
+          )
+        }
+
+    return { actual: received, message, pass }
+  },
+})
+
+expect.extend({
+  // Compare two CSS strings with all whitespace removed
+  // This is probably naive but it's fast and works well enough.
+  toMatchFormattedCss(received, argument) {
+    function format(input) {
+      return prettier.format(input.replace(/\n/g, ''), {
+        parser: 'css',
+        printWidth: 100,
+      })
+    }
+    const options = {
+      comment: 'stripped(received) === stripped(argument)',
+      isNot: this.isNot,
+      promise: this.promise,
+    }
+
+    let formattedReceived = format(received)
+    let formattedArgument = format(argument)
+
+    const pass = formattedReceived === formattedArgument
+
+    const message = pass
+      ? () => {
+          return (
+            this.utils.matcherHint('toMatchCss', undefined, undefined, options) +
+            '\n\n' +
+            `Expected: not ${this.utils.printExpected(formattedReceived)}\n` +
+            `Received: ${this.utils.printReceived(formattedArgument)}`
+          )
+        }
+      : () => {
+          const actual = formattedReceived
+          const expected = formattedArgument
+
+          const diffString = diff(expected, actual, {
+            expand: this.expand,
+          })
+
+          return (
+            this.utils.matcherHint('toMatchCss', undefined, undefined, options) +
+            '\n\n' +
+            (diffString && diffString.includes('- Expect')
+              ? `Difference:\n\n${diffString}`
+              : `Expected: ${this.utils.printExpected(expected)}\n` +
+                `Received: ${this.utils.printReceived(actual)}`)
+          )
+        }
+
+    return { actual: received, message, pass }
+  },
+})