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Usar las versiones asincrónicas de readFile y writeFile de la librearia https://www.npmjs.com/package/jsonfile en el modelo

Name		Name	Last commit message	Last commit date
Latest commit History 2 Commits
.github/workflows		.github/workflows
.gitignore		.gitignore
README.md		README.md
contacts.json		contacts.json
controllers.test.ts		controllers.test.ts
controllers.ts		controllers.ts
index.ts		index.ts
models.test.ts		models.test.ts
models.ts		models.ts
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json

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