Errors with directory names that look like files (.ts/.js)

**note:**
my editor format base.js so the line is not 109 is 94.
maybe this is more a feature not documented, let me know.

**Intended outcome:**
Having a folder with a name extension include in base.js>fileAssociations show a warning, error with a file name would be nice

this happened using Apollo GraphQL for VS Code and someone name a folder char.js

**Actual outcome:**

{ Error: EISDIR: illegal operation on a directory, read
at Object.fs.readSync (fs.js:632:3)
at tryReadSync (fs.js:472:20)
at Object.fs.readFileSync (fs.js:513:19)
at Object.fs.readFileSync (ELECTRON_ASAR.js:563:29)
at GraphQLClientProject.fileDidChange (/home/kurabe/.vscode/extensions/apollographql.vscode-apollo-1.7.1/node_modules/apollo-language-server/lib/project/base.js:109:29)
at connection.onDidChangeWatchedFiles.params (/home/kurabe/.vscode/extensions/apollographql.vscode-apollo-1.7.1/node_modules/apollo-language-server/lib/server.js:95:25)
at handleNotification (/home/kurabe/.vscode/extensions/apollographql.vscode-apollo-1.7.1/node_modules/vscode-jsonrpc/lib/main.js:489:43)
at processMessageQueue (/home/kurabe/.vscode/extensions/apollographql.vscode-apollo-1.7.1/node_modules/vscode-jsonrpc/lib/main.js:260:17)
at Immediate.setImmediate [as _onImmediate] (/home/kurabe/.vscode/extensions/apollographql.vscode-apollo-1.7.1/node_modules/vscode-jsonrpc/lib/main.js:247:13)
at runCallback (timers.js:696:18) errno: -21, syscall: 'read', code: 'EISDIR' }

**How to reproduce the issue:**
name a folder with some of the extension of base.js>fileAssociations

**Versions**
apollographql.vscode-apollo-1.7.1 with apollo-language-server v1.9.1

Start in apollo-language-server/lib/project/base.js at GraphQLClientProject.fileDidChange, especially the fileAssociations handling identified by the report. Reproduce the case with a directory named like a configured .js or .ts file and inspect how the EISDIR error is handled. Done means the directory no longer causes an unhandled read error and produces the requested warning or file-specific error.

Written by the indexing model from the issue text.