Mixing
TypeScript 3 now produces an error with btoa()
0
The code below worked fine until I upgraded to Typescript 3. Why is that?
var file = event.target.files[0];
var reader = new FileReader();
reader.onload = () => {
this.fileForUpload.FileName = file.name;
this.fileForUpload.FileType = file.type;
var encodedString = btoa(reader.result);
console.log(encodedString);
}
reader.readAsDataURL(file);
Now it throws this error:
Argument of type 'string | ArrayBuffer' is not assignable to parameter of type 'string'.
Type 'ArrayBuffer' is not assignable to type 'string'.
What's the fix?
typescript
edited Nov 19 '18 at 18:24
pushkin
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
add a comment |
0
The code below worked fine until I upgraded to Typescript 3. Why is that?
var file = event.target.files[0];
var reader = new FileReader();
reader.onload = () => {
this.fileForUpload.FileName = file.name;
this.fileForUpload.FileType = file.type;
var encodedString = btoa(reader.result);
console.log(encodedString);
}
reader.readAsDataURL(file);
Now it throws this error:
Argument of type 'string | ArrayBuffer' is not assignable to parameter of type 'string'.
Type 'ArrayBuffer' is not assignable to type 'string'.
What's the fix?
typescript
edited Nov 19 '18 at 18:24
pushkin
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20
add a comment |
0
0
0
The code below worked fine until I upgraded to Typescript 3. Why is that?
var file = event.target.files[0];
var reader = new FileReader();
reader.onload = () => {
this.fileForUpload.FileName = file.name;
this.fileForUpload.FileType = file.type;
var encodedString = btoa(reader.result);
console.log(encodedString);
}
reader.readAsDataURL(file);
Now it throws this error:
Argument of type 'string | ArrayBuffer' is not assignable to parameter of type 'string'.
Type 'ArrayBuffer' is not assignable to type 'string'.
What's the fix?
typescript
edited Nov 19 '18 at 18:24
pushkin
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
The code below worked fine until I upgraded to Typescript 3. Why is that?
var file = event.target.files[0];
var reader = new FileReader();
reader.onload = () => {
this.fileForUpload.FileName = file.name;
this.fileForUpload.FileType = file.type;
var encodedString = btoa(reader.result);
console.log(encodedString);
}
reader.readAsDataURL(file);
Now it throws this error:
Argument of type 'string | ArrayBuffer' is not assignable to parameter of type 'string'.
Type 'ArrayBuffer' is not assignable to type 'string'.
What's the fix?
typescript
typescript
edited Nov 19 '18 at 18:24
pushkin
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
edited Nov 19 '18 at 18:24
pushkin
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
edited Nov 19 '18 at 18:24
pushkin
3,980112651
edited Nov 19 '18 at 18:24
pushkin
3,980112651
edited Nov 19 '18 at 18:24
pushkin
3,980112651
3,980112651
asked Nov 19 '18 at 18:15
MarkMark
71231735
asked Nov 19 '18 at 18:15
MarkMark
71231735
asked Nov 19 '18 at 18:15
MarkMark
71231735
71231735
Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20
add a comment |
Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20
Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20
Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20
add a comment |
1 Answer
1
active
oldest
votes
0
As explained on MDN, that property can be either of those types, depending on how you read the reader.
Make sure it's actually going to be string, then cast it.
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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0
As explained on MDN, that property can be either of those types, depending on how you read the reader.
Make sure it's actually going to be string, then cast it.
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
add a comment |
0
As explained on MDN, that property can be either of those types, depending on how you read the reader.
Make sure it's actually going to be string, then cast it.
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
add a comment |
0
0
0
As explained on MDN, that property can be either of those types, depending on how you read the reader.
Make sure it's actually going to be string, then cast it.
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
As explained on MDN, that property can be either of those types, depending on how you read the reader.
Make sure it's actually going to be string, then cast it.
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
answered Nov 19 '18 at 18:20
SLaksSLaks
678k13916281751
678k13916281751
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
add a comment |
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
updated, im using reader.readAsDataURL(file);
– Mark
Nov 19 '18 at 18:23
1
1
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
You need to cast it.
– SLaks
Nov 19 '18 at 18:27
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
I tried var encodedString = btoa(reader.result).toString(); and still errors
– Mark
Nov 19 '18 at 18:33
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
<string>window.btoa(reader.result); this too does not work?
– Mark
Nov 19 '18 at 18:45
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
window.btoa(<string>reader.result); works, cheers.
– Mark
Nov 19 '18 at 18:54
add a comment |
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Which FileReader method are you using to read the file?
– Alexander Staroselsky
Nov 19 '18 at 18:20