如何修复 Angular 18 错误：A namespace-style import cannot be called or constructed ...

问题

将 Angular 应用升级到 Angular 18 后，你看到如下构建错误：

ts_error.txt

✘ [ERROR] TS2349: This expression is not callable.
  Type 'typeof import("/home/uli/myproject/node_modules/dayjs/index.d.ts")' has no call signatures. [plugin angular-compiler]

    src/app/day-js.service.ts:37:15:
      37 │     const d2 = dayjs(d);
         ╵                ~~~~~

  Type originates at this import. A namespace-style import cannot be called or constructed, and will cause a failure at runtime. Consider using a default import or import require here instead.

    src/app/day-js.service.ts:3:0:
      3 │ import * as dayjs from 'dayjs'

✘ [ERROR] TS2349: This expression is not callable.
  Type 'typeof import("/home/uli/myproject/node_modules/dayjs/index.d.ts")' has no call signatures. [plugin angular-compiler]

    src/app/day-js.service.ts:37:15:
      37 │     const d2 = dayjs(d);
         ╵                ~~~~~

  Type originates at this import. A namespace-style import cannot be called or constructed, and will cause a failure at runtime. Consider using a default import or import require here instead.

    src/app/day-js.service.ts:3:0:
      3 │ import * as dayjs from 'dayjs'

解决方案

Typescript 5.4 不再支持 import * as X from 'X。

因此，你需要将

namespace_import_bad.ts

import * as dayjs from 'dayjs'

import * as dayjs from 'dayjs'

改为

default_import_fixed.ts

import dayjs from 'dayjs'

import dayjs from 'dayjs'

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