Why are class definitions automatically recognized without importing them
So I have a main.ts
window.onload = function() {
let test: Testing = new Testing();
};
and a Testing.ts
class Testing {
}
and here is my tsconfig.json
{
"compilerOptions": {
"target": "es6",
"module": "commonjs",
},
"compileOnSave": true,
"buildOnSave": false
}
So I'm wondering why without importing the Testing class in main.ts, typescript is able to find it automatically.
And then weirdly enough, when I change the Testing class to include an export before it, typescript all a sudden complains saying, Cannot find name 'Testing'. And only when I import the Testing class in my main.ts, then will it start working.
I'm assuming this question is regarding to how modules work, so if someone could explain what's going on here, that would be awesome.
Thanks.
javascript typescript
asked Nov 24 '18 at 19:21
JacobJacob
13718
add a comment |
So I have a main.ts
window.onload = function() {
let test: Testing = new Testing();
};
and a Testing.ts
class Testing {
}
and here is my tsconfig.json
{
"compilerOptions": {
"target": "es6",
"module": "commonjs",
},
"compileOnSave": true,
"buildOnSave": false
}
So I'm wondering why without importing the Testing class in main.ts, typescript is able to find it automatically.
And then weirdly enough, when I change the Testing class to include an export before it, typescript all a sudden complains saying, Cannot find name 'Testing'. And only when I import the Testing class in my main.ts, then will it start working.
I'm assuming this question is regarding to how modules work, so if someone could explain what's going on here, that would be awesome.
Thanks.
javascript typescript
asked Nov 24 '18 at 19:21
JacobJacob
13718
What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
2
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
1
Probably the file counts as a script (which runs in global scope) until you add anexportorimportstatement which marks it as a module with its own local scope.
– Bergi
Nov 24 '18 at 19:40
add a comment |
So I have a main.ts
window.onload = function() {
let test: Testing = new Testing();
};
and a Testing.ts
class Testing {
}
and here is my tsconfig.json
{
"compilerOptions": {
"target": "es6",
"module": "commonjs",
},
"compileOnSave": true,
"buildOnSave": false
}
So I'm wondering why without importing the Testing class in main.ts, typescript is able to find it automatically.
And then weirdly enough, when I change the Testing class to include an export before it, typescript all a sudden complains saying, Cannot find name 'Testing'. And only when I import the Testing class in my main.ts, then will it start working.
I'm assuming this question is regarding to how modules work, so if someone could explain what's going on here, that would be awesome.
Thanks.
javascript typescript
asked Nov 24 '18 at 19:21
JacobJacob
13718
So I have a main.ts
window.onload = function() {
let test: Testing = new Testing();
};
and a Testing.ts
class Testing {
}
and here is my tsconfig.json
{
"compilerOptions": {
"target": "es6",
"module": "commonjs",
},
"compileOnSave": true,
"buildOnSave": false
}
So I'm wondering why without importing the Testing class in main.ts, typescript is able to find it automatically.
And then weirdly enough, when I change the Testing class to include an export before it, typescript all a sudden complains saying, Cannot find name 'Testing'. And only when I import the Testing class in my main.ts, then will it start working.
I'm assuming this question is regarding to how modules work, so if someone could explain what's going on here, that would be awesome.
Thanks.
javascript typescript
javascript typescript
asked Nov 24 '18 at 19:21
JacobJacob
13718
asked Nov 24 '18 at 19:21
JacobJacob
13718
asked Nov 24 '18 at 19:21
JacobJacob
13718
asked Nov 24 '18 at 19:21
JacobJacob
13718
asked Nov 24 '18 at 19:21
JacobJacob
13718
13718
What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
2
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
1
Probably the file counts as a script (which runs in global scope) until you add anexportorimportstatement which marks it as a module with its own local scope.
– Bergi
Nov 24 '18 at 19:40
add a comment |
What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
2
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
1
Probably the file counts as a script (which runs in global scope) until you add anexportorimportstatement which marks it as a module with its own local scope.
– Bergi
Nov 24 '18 at 19:40
What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
2
2
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
1
1
Probably the file counts as a script (which runs in global scope) until you add an
export or import statement which marks it as a module with its own local scope.– Bergi
Nov 24 '18 at 19:40
Probably the file counts as a script (which runs in global scope) until you add an
export or import statement which marks it as a module with its own local scope.– Bergi
Nov 24 '18 at 19:40
add a comment |
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What editor are you using?
– Washington Guedes
Nov 24 '18 at 19:24
@WashingtonGuedes Visual Studio Code
– Jacob
Nov 24 '18 at 19:26
2
If your bundler puts it all in one file wouldn't need imports
– charlietfl
Nov 24 '18 at 19:27
1
Probably the file counts as a script (which runs in global scope) until you add an
exportorimportstatement which marks it as a module with its own local scope.– Bergi
Nov 24 '18 at 19:40