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Merge pull request #2167 from Microsoft/documentRegistry

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Fix issue where source files could get corrupted.
This commit is contained in:
CyrusNajmabadi 2015-02-27 16:29:57 -08:00
commit 419d379912
10 changed files with 152 additions and 174 deletions
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138
src/services/services.ts
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@ -1270,31 +1270,21 @@ module ts {
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(
sourceFile: SourceFile,
fileName: string,
compilationSettings: CompilerOptions,
scriptSnapshot: IScriptSnapshot,
version: string,
textChangeRange: TextChangeRange): SourceFile;
version: string): SourceFile;
/**
* Informs the DocumentRegistry that a file is not needed any longer.
@ -1442,7 +1432,11 @@ module ts {
interface DocumentRegistryEntry {
sourceFile: SourceFile;
refCount: number;
// The number of language services that this source file is referenced in. When no more
// language services are referencing the file, then the file can be removed from the
// registry.
languageServiceRefCount: number;
owners: string[];
}
@ -1671,6 +1665,8 @@ module ts {
}
export function createDocumentRegistry(): DocumentRegistry {
// Maps from compiler setting target (ES3, ES5, etc.) to all the cached documents we have
// for those settings.
var buckets: Map<Map<DocumentRegistryEntry>> = {};
function getKeyFromCompilationSettings(settings: CompilerOptions): string {
@ -1694,7 +1690,7 @@ module ts {
var entry = entries[i];
sourceFiles.push({
name: i,
refCount: entry.refCount,
refCount: entry.languageServiceRefCount,
references: entry.owners.slice(0)
});
}
@ -1707,43 +1703,54 @@ module ts {
return JSON.stringify(bucketInfoArray, null, 2);
}
function acquireDocument(
fileName: string,
compilationSettings: CompilerOptions,
scriptSnapshot: IScriptSnapshot,
version: string): SourceFile {
var bucket = getBucketForCompilationSettings(compilationSettings, /*createIfMissing*/ true);
var entry = lookUp(bucket, fileName);
if (!entry) {
var sourceFile = createLanguageServiceSourceFile(fileName, scriptSnapshot, compilationSettings.target, version, /*setNodeParents:*/ false);
bucket[fileName] = entry = {
sourceFile: sourceFile,
refCount: 0,
owners: []
};
}
entry.refCount++;
return entry.sourceFile;
function acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile {
return acquireOrUpdateDocument(fileName, compilationSettings, scriptSnapshot, version, /*acquiring:*/ true);
}
function updateDocument(
sourceFile: SourceFile,
function updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile {
return acquireOrUpdateDocument(fileName, compilationSettings, scriptSnapshot, version, /*acquiring:*/ false);
}
function acquireOrUpdateDocument(
fileName: string,
compilationSettings: CompilerOptions,
scriptSnapshot: IScriptSnapshot,
version: string,
textChangeRange: TextChangeRange
): SourceFile {
acquiring: boolean): SourceFile {
var bucket = getBucketForCompilationSettings(compilationSettings, /*createIfMissing*/ false);
Debug.assert(bucket !== undefined);
var bucket = getBucketForCompilationSettings(compilationSettings, /*createIfMissing*/ true);
var entry = lookUp(bucket, fileName);
Debug.assert(entry !== undefined);
if (!entry) {
Debug.assert(acquiring, "How could we be trying to update a document that the registry doesn't have?");
// Have never seen this file with these settings. Create a new source file for it.
var sourceFile = createLanguageServiceSourceFile(fileName, scriptSnapshot, compilationSettings.target, version, /*setNodeParents:*/ false);
bucket[fileName] = entry = {
sourceFile: sourceFile,
languageServiceRefCount: 0,
owners: []
};
}
else {
// We have an entry for this file. However, it may be for a different version of
// the script snapshot. If so, update it appropriately. Otherwise, we can just
// return it as is.
if (entry.sourceFile.version !== version) {
entry.sourceFile = updateLanguageServiceSourceFile(entry.sourceFile, scriptSnapshot, version,
scriptSnapshot.getChangeRange(entry.sourceFile.scriptSnapshot));
}
}
// If we're acquiring, then this is the first time this LS is asking for this document.
// Increase our ref count so we know there's another LS using the document. If we're
// not acquiring, then that means the LS is 'updating' the file instead, and that means
// it has already acquired the document previously. As such, we do not need to increase
// the ref count.
if (acquiring) {
entry.languageServiceRefCount++;
}
entry.sourceFile = updateLanguageServiceSourceFile(entry.sourceFile, scriptSnapshot, version, textChangeRange);
return entry.sourceFile;
}
@ -1752,10 +1759,10 @@ module ts {
Debug.assert(bucket !== undefined);
var entry = lookUp(bucket, fileName);
entry.refCount--;
entry.languageServiceRefCount--;
Debug.assert(entry.refCount >= 0);
if (entry.refCount === 0) {
Debug.assert(entry.languageServiceRefCount >= 0);
if (entry.languageServiceRefCount === 0) {
delete bucket[fileName];
}
}
@ -2162,19 +2169,34 @@ module ts {
// it is safe to reuse the souceFiles; if not, then the shape of the AST can change, and the oldSourceFile
// can not be reused. we have to dump all syntax trees and create new ones.
if (!changesInCompilationSettingsAffectSyntax) {
// Check if the old program had this file already
var oldSourceFile = program && program.getSourceFile(fileName);
if (oldSourceFile) {
// This SourceFile is safe to reuse, return it
if (sourceFileUpToDate(oldSourceFile)) {
return oldSourceFile;
}
// We have an older version of the sourceFile, incrementally parse the changes
var textChangeRange = hostFileInformation.scriptSnapshot.getChangeRange(oldSourceFile.scriptSnapshot);
return documentRegistry.updateDocument(oldSourceFile, fileName, newSettings, hostFileInformation.scriptSnapshot, hostFileInformation.version, textChangeRange);
// We already had a source file for this file name. Go to the registry to
// ensure that we get the right up to date version of it. We need this to
// address the following 'race'. Specifically, say we have the following:
//
// LS1
// \
// DocumentRegistry
// /
// LS2
//
// Each LS has a reference to file 'foo.ts' at version 1. LS2 then updates
// it's version of 'foo.ts' to version 2. This will cause LS2 and the
// DocumentRegistry to have version 2 of the document. HOwever, LS1 will
// have version 1. And *importantly* this source file will be *corrupt*.
// The act of creating version 2 of the file irrevocably damages the version
// 1 file.
//
// So, later when we call into LS1, we need to make sure that it doesn't use
// it's source file any more, and instead defers to DocumentRegistry to get
// either version 1, version 2 (or some other version) depending on what the
// host says should be used.
return documentRegistry.updateDocument(fileName, newSettings, hostFileInformation.scriptSnapshot, hostFileInformation.version);
}
// We didn't already have the file. Fall through and acquire it from the registry.
}
// Could not find this file in the old program, create a new SourceFile for it.
@ -2228,8 +2250,8 @@ module ts {
function dispose(): void {
if (program) {
forEach(program.getSourceFiles(),
(f) => { documentRegistry.releaseDocument(f.fileName, program.getCompilerOptions()); });
forEach(program.getSourceFiles(), f =>
documentRegistry.releaseDocument(f.fileName, program.getCompilerOptions()));
}
}

16
tests/baselines/reference/APISample_compile.js
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@ -1872,25 +1872,17 @@ declare module "typescript" {
acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Informs the DocumentRegistry that a file is not needed any longer.
*

22
tests/baselines/reference/APISample_compile.types
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@ -5849,36 +5849,24 @@ declare module "typescript" {
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
>updateDocument : (sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange) => SourceFile
>sourceFile : SourceFile
>SourceFile : SourceFile
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
>updateDocument : (fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string) => SourceFile
>fileName : string
>compilationSettings : CompilerOptions
>CompilerOptions : CompilerOptions
>scriptSnapshot : IScriptSnapshot
>IScriptSnapshot : IScriptSnapshot
>version : string
>textChangeRange : TextChangeRange
>TextChangeRange : TextChangeRange
>SourceFile : SourceFile
/**

16
tests/baselines/reference/APISample_linter.js
View File

@ -1903,25 +1903,17 @@ declare module "typescript" {
acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Informs the DocumentRegistry that a file is not needed any longer.
*

22
tests/baselines/reference/APISample_linter.types
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@ -5995,36 +5995,24 @@ declare module "typescript" {
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
>updateDocument : (sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange) => SourceFile
>sourceFile : SourceFile
>SourceFile : SourceFile
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
>updateDocument : (fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string) => SourceFile
>fileName : string
>compilationSettings : CompilerOptions
>CompilerOptions : CompilerOptions
>scriptSnapshot : IScriptSnapshot
>IScriptSnapshot : IScriptSnapshot
>version : string
>textChangeRange : TextChangeRange
>TextChangeRange : TextChangeRange
>SourceFile : SourceFile
/**

16
tests/baselines/reference/APISample_transform.js
View File

@ -1904,25 +1904,17 @@ declare module "typescript" {
acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Informs the DocumentRegistry that a file is not needed any longer.
*

22
tests/baselines/reference/APISample_transform.types
View File

@ -5945,36 +5945,24 @@ declare module "typescript" {
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
>updateDocument : (sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange) => SourceFile
>sourceFile : SourceFile
>SourceFile : SourceFile
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
>updateDocument : (fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string) => SourceFile
>fileName : string
>compilationSettings : CompilerOptions
>CompilerOptions : CompilerOptions
>scriptSnapshot : IScriptSnapshot
>IScriptSnapshot : IScriptSnapshot
>version : string
>textChangeRange : TextChangeRange
>TextChangeRange : TextChangeRange
>SourceFile : SourceFile
/**

16
tests/baselines/reference/APISample_watcher.js
View File

@ -1941,25 +1941,17 @@ declare module "typescript" {
acquireDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
/**
* Informs the DocumentRegistry that a file is not needed any longer.
*

22
tests/baselines/reference/APISample_watcher.types
View File

@ -6118,36 +6118,24 @@ declare module "typescript" {
/**
* Request an updated version of an already existing SourceFile with a given fileName
* and compilationSettings. The update will intern call updateLanguageServiceSourceFile
* and compilationSettings. The update will in-turn call updateLanguageServiceSourceFile
* to get an updated SourceFile.
*
* Note: It is not allowed to call update on a SourceFile that was not acquired from this
* registry originally.
*
* @param sourceFile The original sourceFile object to update
* @param fileName The name of the file requested
* @param compilationSettings Some compilation settings like target affects the
* shape of a the resulting SourceFile. This allows the DocumentRegistry to store
* multiple copies of the same file for different compilation settings.
* @parm scriptSnapshot Text of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm version Current version of the file. Only used if the file was not found
* in the registry and a new one was created.
* @parm textChangeRange Change ranges since the last snapshot. Only used if the file
* was not found in the registry and a new one was created.
* @param scriptSnapshot Text of the file.
* @param version Current version of the file.
*/
updateDocument(sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange): SourceFile;
>updateDocument : (sourceFile: SourceFile, fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string, textChangeRange: TextChangeRange) => SourceFile
>sourceFile : SourceFile
>SourceFile : SourceFile
updateDocument(fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string): SourceFile;
>updateDocument : (fileName: string, compilationSettings: CompilerOptions, scriptSnapshot: IScriptSnapshot, version: string) => SourceFile
>fileName : string
>compilationSettings : CompilerOptions
>CompilerOptions : CompilerOptions
>scriptSnapshot : IScriptSnapshot
>IScriptSnapshot : IScriptSnapshot
>version : string
>textChangeRange : TextChangeRange
>TextChangeRange : TextChangeRange
>SourceFile : SourceFile
/**

36
tests/cases/unittests/services/documentRegistry.ts
View File

@ -35,4 +35,40 @@ describe("DocumentRegistry", () => {
assert(f3 === f4, "Changed module: Expected to have the same instance of the document");
});
it("Acquiring document gets correct version 1", () => {
var documentRegistry = ts.createDocumentRegistry();
var defaultCompilerOptions = ts.getDefaultCompilerOptions();
// Simulate one LS getting the document.
var f1 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, ts.ScriptSnapshot.fromString("var x = 1;"), /* version */ "1");
// Simulate another LS getting the document at another version.
var f2 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, ts.ScriptSnapshot.fromString("var x = 1;"), /* version */ "2");
assert(f2.version === "2");
});
it("Acquiring document gets correct version 2", () => {
var documentRegistry = ts.createDocumentRegistry();
var defaultCompilerOptions = ts.getDefaultCompilerOptions();
var contents = "var x = 1;"
var snapshot = ts.ScriptSnapshot.fromString(contents);
// Always treat any change as a full change.
snapshot.getChangeRange = old => ts.createTextChangeRange(ts.createTextSpan(0, contents.length), contents.length);
// Simulate one LS getting the document.
var f1 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "1");
// Simulate another LS getting that document.
var f2 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "1");
// Now LS1 updates their document.
var f3 = documentRegistry.updateDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "2");
// Now LS2 tries to update their document.
var f4 = documentRegistry.updateDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "3");
});
});