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TODO: Move this page to .md in repo

Development

Versioning

TODO: Current versioning is not ideal 😢

How to release

1. Update src/version.ts
2. Make a new release.

How to bump Deno

1. Update ci.yml
2. Bump deno_std using dem

$ dem update https://deno.land/std@0.67.0

Limitations/Differences

Decorator metadata is not supported

Using decorator metadata in Deno causes circular references between entities for the following reasons:

• Deno only supports esnext as a compilation target.
• TypeORM is not yet compatible with esnext.

See also: https://github.com/typeorm/typeorm/issues/4103

Workarounds:

• use EntitySchema instead of ES decorators and decorator metadata.
• specify the column type with ColumnOptions.type as follows:

@Entity()
class User {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ type: 'varchar' }) // or `@Column({ type: String })`
  name!: string;
}

@TransactionRepository is not supported

This decorator depends on decorator metadata.

@Column

• ColumnOptions.type is required.
  • This is due to lack of decorator metadata support.

binary type is mapped to Uint8Array instead of Buffer

• This is because in Deno, binary data is usually represented by a Uint8Array.

glob

The following patterns are not supported:

• /path/to/entities/*{.js,.ts}

(sqlite only) @CreateDateColumn and @UpdateDateColumn are not currently supported

• https://github.com/dyedgreen/deno-sqlite/blob/a68be951b8a09e5df3eb76a1659d93e18ba048c5/build/src/vfs.c#L235

SqliteDriver

Some types are treated differently from the original typeorm:

• int8, bigint, and unsigned big int are mapped to BigInt #88

Required permissions

This module requires --allow-net permission, because it uses dynamic import to implement lazy loading of third party modules. The following table shows the additional permissions required for each driver:

driver	--allow-read	--allow-write	--allow-env	--allow-plugin	--allow-run
sqlite	✔️	✔️
postgres
mysql

Articles

• Create a Deno Rest API: A promising start with Alosaur and TypeORM