我遇到了类似的问题，原因是打字稿无法导入该文件。

我已经通过向files.d.ts添加文件类型定义解决了该问题：

declare module "*.pdf" {
  const file: Buffer;
  export default file;
}

declare module "*.jpeg" {
  const src: string;
  export default src;
}

declare module "*.png" {
  const src: string;
  export default src;
}

在tsconfig.json中引用此文件：

{
  "compilerOptions": {
    /* ... */
  },"files": ["./src/@types/files.d.ts"],"include": ["src/**/*"],"exclude": ["node_modules"]
}

并将文件转换添加到jest.config.js：

module.exports = {
  preset: "ts-jest",testEnvironment: "node",roots: ["<rootDir>/src/"],moduleNameMapper: {
    "@app/(.*)": "<rootDir>/src/$1","@lib/(.*)": "<rootDir>/src/lib/$1",},transform: { // Transforms here
    "\\.(gql|graphql)$": "@jagi/jest-transform-graphql","\\.(html|html|txt|pem|key)$": "./jest-transform-text.js","\\.(p12|pdf|otf|ttf)$": "./jest-transform-buffer.js","^(?!.*\\.(js|jsx|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"

  },coverageReporters: ["text","lcov"],};

转换文件示例：

// jest-transform-buffer.js

"use strict";
const fs = require("fs");
module.exports = {
  process(src,filename) {
    const data = fs.readFileSync(filename,"hex");
    return (
      'module.exports=Buffer.from("' +
      data +
      '","hex");module.exports.default=module.exports;'
    );
  },};

对于通过create react应用程序生成的图像（或仅需要文件名的其他文件）：

'use strict';

const path = require('path');
const camelcase = require('camelcase');

// This is a custom Jest transformer turning file imports into filenames.
// http://facebook.github.io/jest/docs/en/webpack.html

module.exports = {
  process(src,filename) {
    const assetFilename = JSON.stringify(path.basename(filename));

    if (filename.match(/\.svg$/)) {
      // Based on how SVGR generates a component name:
      // https://github.com/smooth-code/svgr/blob/01b194cf967347d43d4cbe6b434404731b87cf27/packages/core/src/state.js#L6
      const pascalCaseFilename = camelcase(path.parse(filename).name,{
        pascalCase: true,});
      const componentName = `Svg${pascalCaseFilename}`;
      return `const React = require('react');
      module.exports = {
        __esModule: true,default: ${assetFilename},ReactComponent: React.forwardRef(function ${componentName}(props,ref) {
          return {
            $$typeof: Symbol.for('react.element'),type: 'svg',ref: ref,key: null,props: Object.assign({},props,{
              children: ${assetFilename}
            })
          };
        }),};`;
    }

    return `module.exports = ${assetFilename};`;
  },};