flow like the river

VISUALIZACION/node_modules/polished/lib/internalHelpers/_errors.js.flow

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+// @flow
+
+// based on https://github.com/styled-components/styled-components/blob/fcf6f3804c57a14dd7984dfab7bc06ee2edca044/src/utils/error.js
+
+declare var preval: Function
+
+/**
+ * Parse errors.md and turn it into a simple hash of code: message
+ * @private
+ */
+const ERRORS = preval`
+  const fs = require('fs');
+  const md = fs.readFileSync(__dirname + '/errors.md', 'utf8');
+  module.exports = md.split(/^#/gm).slice(1).reduce((errors, str) => {
+    const [, code, message] = str.split(/^.*?(\\d+)\\s*\\n/)
+    errors[code] = message
+    return errors;
+  }, {});
+`
+
+/**
+ * super basic version of sprintf
+ * @private
+ */
+function format(...args) {
+  let a = args[0]
+  const b = []
+  let c
+
+  for (c = 1; c < args.length; c += 1) {
+    b.push(args[c])
+  }
+
+  b.forEach(d => {
+    a = a.replace(/%[a-z]/, d)
+  })
+
+  return a
+}
+
+/**
+ * Create an error file out of errors.md for development and a simple web link to the full errors
+ * in production mode.
+ * @private
+ */
+export default class PolishedError extends Error {
+  constructor(code: string | number, ...args: Array<any>) {
+    if (process.env.NODE_ENV === 'production') {
+      super(
+        `An error occurred. See https://github.com/styled-components/polished/blob/main/src/internalHelpers/errors.md#${code} for more information.`,
+      )
+    } else {
+      super(format(ERRORS[code], ...args))
+    }
+  }
+}