chore: remove demo and add type tests

Author: Tim Streicher

src/demo.ts

@@ -0,0 +1,93 @@
+import type {FilterSetConfig} from '../types'
+import {convertFilterSetConfig} from '../middleware'
+
+interface NumberData {
+  number: number
+  noNumber?: Date
+}
+
+interface Data {
+  data?: NumberData
+  text?: string
+  new?: boolean
+}
+
+test('Error when attribute is not in data type', () => {
+  const simpleConfig: FilterSetConfig<Data> = {
+    // @ts-expect-error number is not part of data type
+    number: {value: 123},
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  expect(converted).toEqual({number: 123})
+})
+
+test('Error when unknown filter is used', () => {
+  const simpleConfig: FilterSetConfig<Data> = {
+    // @ts-expect-error foo is not defined as a filter
+    number: {foo: 123},
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  // eslint-disable-next-line camelcase
+  expect(converted).toEqual({number__foo: 123})
+})
+
+test('Error when attribute has the wrong type', () => {
+  const simpleConfig: FilterSetConfig<Data> = {
+    // @ts-expect-error text is of type string
+    text: {value: 123},
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  expect(converted).toEqual({text: 'string'})
+})
+
+interface FilterSetMapping {
+  data: 'lt' | 'gt'
+  text: 'startswith' | 'exact'
+}
+
+test('error when filter key is disallowed in mapping', () => {
+  const numberData = {number: 123}
+  const simpleConfig: FilterSetConfig<Data, FilterSetMapping> = {
+    data: {
+      // @ts-expect-error lte is not allowed
+      lte: numberData,
+    },
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  // eslint-disable-next-line camelcase
+  expect(converted).toEqual({data__lte: numberData})
+})
+
+interface CustomFilter {
+  custom1: any[]
+  custom2: number
+}
+
+interface FilterSetMappingCustom {
+  data: 'lt' | 'gt' | 'custom1'
+  text: 'startswith' | 'exact' | 'custom2'
+}
+
+test('error when custom filter key is not allowed', () => {
+  const simpleConfig: FilterSetConfig<Data, FilterSetMappingCustom, CustomFilter> = {
+    text: {
+      // @ts-expect-error custom filter is not allowed
+      custom1: '',
+    },
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  // eslint-disable-next-line camelcase
+  expect(converted).toEqual({text__custom1: ''})
+})
+
+test('error when custom has the wrong type', () => {
+  const simpleConfig: FilterSetConfig<Data, FilterSetMappingCustom, CustomFilter> = {
+    text: {
+      // @ts-expect-error custom filter has wrong type
+      custom2: '',
+    },
+  }
+  const converted = convertFilterSetConfig(simpleConfig)
+  // eslint-disable-next-line camelcase
+  expect(converted).toEqual({text__custom2: ''})
+})