Add import util for typed-document-string helper

[eddeee888]

Description

Continuation of #10863

After trying the alpha version locally, I realised client plugins would need to generate an import statement to this effect:

this._generateImport(
  {
    moduleName: '@graphql-typed-document-node/core',
    propName: 'DocumentTypeDecoration',
  },
  'DocumentTypeDecoration',
  true,
)

So this PR improves the utility:

• Makes typedDocumentString an object
• Adds typedDocumentString.template to replace typedDocumentStringTemplate
• Adds typedDocumentString.import to help creating import statements

[changeset-bot]

⚠️ No Changeset found

Latest commit: 44e7436

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 2 packages

Name	Type
@graphql-codegen/typed-document-node	Patch
@graphql-codegen/visitor-plugin-common	Minor

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🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphql-codegen/visitor-plugin-common	7.1.0-alpha-20260601150944-44e7436d06cd549e9e499f9f644f17de11d74663	npm ↗︎ unpkg ↗︎
@graphql-codegen/typed-document-node	7.0.3-alpha-20260601150944-44e7436d06cd549e9e499f9f644f17de11d74663	npm ↗︎ unpkg ↗︎

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